diff --git a/composer.lock b/composer.lock
index db744fd..f03ef33 100644
--- a/composer.lock
+++ b/composer.lock
@@ -257,32 +257,33 @@
         },
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-            "version": "1.4.2",
+            "version": "1.5.2",
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                 "url": "https://github.com/guzzle/psr7.git",
-                "reference": "f5b8a8512e2b58b0071a7280e39f14f72e05d87c"
+                "reference": "9f83dded91781a01c63574e387eaa769be769115"
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-                "url": "https://api.github.com/repos/guzzle/psr7/zipball/f5b8a8512e2b58b0071a7280e39f14f72e05d87c",
-                "reference": "f5b8a8512e2b58b0071a7280e39f14f72e05d87c",
+                "url": "https://api.github.com/repos/guzzle/psr7/zipball/9f83dded91781a01c63574e387eaa769be769115",
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                 "shasum": ""
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             "require": {
                 "php": ">=5.4.0",
-                "psr/http-message": "~1.0"
+                "psr/http-message": "~1.0",
+                "ralouphie/getallheaders": "^2.0.5"
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             "provide": {
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             "require-dev": {
-                "phpunit/phpunit": "~4.0"
+                "phpunit/phpunit": "~4.8.36 || ^5.7.27 || ^6.5.8"
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             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.4-dev"
+                    "dev-master": "1.5-dev"
                 }
             },
             "autoload": {
@@ -312,13 +313,14 @@
             "keywords": [
                 "http",
                 "message",
+                "psr-7",
                 "request",
                 "response",
                 "stream",
                 "uri",
                 "url"
             ],
-            "time": "2017-03-20T17:10:46+00:00"
+            "time": "2018-12-04T20:46:45+00:00"
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             "name": "hamcrest/hamcrest-php",
@@ -888,6 +890,46 @@
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+        {
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+            "version": "2.0.5",
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+                "type": "git",
+                "url": "https://github.com/ralouphie/getallheaders.git",
+                "reference": "5601c8a83fbba7ef674a7369456d12f1e0d0eafa"
+            },
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+                "url": "https://api.github.com/repos/ralouphie/getallheaders/zipball/5601c8a83fbba7ef674a7369456d12f1e0d0eafa",
+                "reference": "5601c8a83fbba7ef674a7369456d12f1e0d0eafa",
+                "shasum": ""
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+            "require": {
+                "php": ">=5.3"
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+            "require-dev": {
+                "phpunit/phpunit": "~3.7.0",
+                "satooshi/php-coveralls": ">=1.0"
+            },
+            "type": "library",
+            "autoload": {
+                "files": [
+                    "src/getallheaders.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Ralph Khattar",
+                    "email": "ralph.khattar@gmail.com"
+                }
+            ],
+            "description": "A polyfill for getallheaders.",
+            "time": "2016-02-11T07:05:27+00:00"
+        },
         {
             "name": "rinvex/country",
             "version": "v3.1.0",
@@ -1201,16 +1243,16 @@
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         {
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-            "version": "v3.4.18",
+            "version": "v3.4.21",
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                 "type": "git",
                 "url": "https://github.com/symfony/process.git",
-                "reference": "35c2914a9f50519bd207164c353ae4d59182c2cb"
+                "reference": "0d41dd7d95ed179aed6a13393b0f4f97bfa2d25c"
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-                "reference": "35c2914a9f50519bd207164c353ae4d59182c2cb",
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@@ -1246,20 +1288,20 @@
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             "description": "Symfony Process Component",
             "homepage": "https://symfony.com",
-            "time": "2018-10-14T17:33:21+00:00"
+            "time": "2019-01-02T21:24:08+00:00"
         },
         {
             "name": "symfony/yaml",
-            "version": "v3.4.18",
+            "version": "v3.4.21",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/yaml.git",
-                "reference": "640b6c27fed4066d64b64d5903a86043f4a4de7f"
+                "reference": "554a59a1ccbaac238a89b19c8e551a556fd0e2ea"
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-                "reference": "640b6c27fed4066d64b64d5903a86043f4a4de7f",
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@@ -1305,7 +1347,7 @@
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             "description": "Symfony Yaml Component",
             "homepage": "https://symfony.com",
-            "time": "2018-10-02T16:33:53+00:00"
+            "time": "2019-01-01T13:45:19+00:00"
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             "name": "zonuexe/http-accept-language",
@@ -1462,16 +1504,16 @@
         },
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             "name": "heroku/heroku-buildpack-php",
-            "version": "v146",
+            "version": "v148",
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                 "type": "git",
                 "url": "https://github.com/heroku/heroku-buildpack-php.git",
-                "reference": "a380d44126a056cc5b7daaa0714714e3c888689f"
+                "reference": "d331bfb9251d8a091d3a0d29e25ffcdb801577e1"
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-                "url": "https://api.github.com/repos/heroku/heroku-buildpack-php/zipball/a380d44126a056cc5b7daaa0714714e3c888689f",
-                "reference": "a380d44126a056cc5b7daaa0714714e3c888689f",
+                "url": "https://api.github.com/repos/heroku/heroku-buildpack-php/zipball/d331bfb9251d8a091d3a0d29e25ffcdb801577e1",
+                "reference": "d331bfb9251d8a091d3a0d29e25ffcdb801577e1",
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@@ -1502,7 +1544,7 @@
                 "nginx",
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             ],
-            "time": "2018-11-08T19:23:29+00:00"
+            "time": "2018-12-20T21:53:40+00:00"
         },
         {
             "name": "myclabs/deep-copy",
@@ -2899,16 +2941,16 @@
         },
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-            "version": "v3.4.18",
+            "version": "v3.4.21",
             "source": {
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                 "url": "https://github.com/symfony/var-dumper.git",
-                "reference": "ff8ac19e97e5c7c3979236b584719a1190f84181"
+                "reference": "a5f39641bb62e8b74e343467b145331273f615a2"
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-                "reference": "ff8ac19e97e5c7c3979236b584719a1190f84181",
+                "url": "https://api.github.com/repos/symfony/var-dumper/zipball/a5f39641bb62e8b74e343467b145331273f615a2",
+                "reference": "a5f39641bb62e8b74e343467b145331273f615a2",
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@@ -2964,7 +3006,7 @@
                 "debug",
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             ],
-            "time": "2018-10-02T16:33:53+00:00"
+            "time": "2019-01-01T13:45:19+00:00"
         },
         {
             "name": "theseer/tokenizer",
@@ -3008,20 +3050,21 @@
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         {
             "name": "webmozart/assert",
-            "version": "1.3.0",
+            "version": "1.4.0",
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                 "type": "git",
                 "url": "https://github.com/webmozart/assert.git",
-                "reference": "0df1908962e7a3071564e857d86874dad1ef204a"
+                "reference": "83e253c8e0be5b0257b881e1827274667c5c17a9"
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-                "url": "https://api.github.com/repos/webmozart/assert/zipball/0df1908962e7a3071564e857d86874dad1ef204a",
-                "reference": "0df1908962e7a3071564e857d86874dad1ef204a",
+                "url": "https://api.github.com/repos/webmozart/assert/zipball/83e253c8e0be5b0257b881e1827274667c5c17a9",
+                "reference": "83e253c8e0be5b0257b881e1827274667c5c17a9",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.3.3 || ^7.0"
+                "php": "^5.3.3 || ^7.0",
+                "symfony/polyfill-ctype": "^1.8"
             },
             "require-dev": {
                 "phpunit/phpunit": "^4.6",
@@ -3054,7 +3097,7 @@
                 "check",
                 "validate"
             ],
-            "time": "2018-01-29T19:49:41+00:00"
+            "time": "2018-12-25T11:19:39+00:00"
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     ],
     "aliases": [],