ci: Don't display Composer progress

In order to make the logs easier to read

.appveyor.yml

@@ -12,8 +12,8 @@ install:
   - echo extension=C:\tools\php71\ext\php_openssl.dll >> C:\tools\php71\php.ini
   - echo extension=C:\tools\php71\ext\php_mbstring.dll >> C:\tools\php71\php.ini
   - echo extension=C:\tools\php71\ext\php_xsl.dll >> C:\tools\php71\php.ini
-  - composer install --no-dev
-  - composer global require phpunit/phpunit:^6.0
+  - composer install --no-dev --no-progress
+  - composer global require phpunit/phpunit:^6.0 --no-progress
   - C:\Python36\python.exe -m pip install youtube-dl
 
 test_script:

.travis.yml

@@ -5,5 +5,5 @@ addons:
     apt:
         packages:
             - language-pack-fr
-install: composer install
+install: composer install --no-progress
 after_success: bash <(curl -s https://codecov.io/bash)