Some docs + SSL

- added relnotes
- added README docs
- switched to HTTPS for the default server

README.md

@@ -35,6 +35,7 @@ You can also download the latest version of PlantUML straight into `plantuml-jar
 - Syntax highlight
 - Autocompletion
 - Preview of buffer or region
+- [EXPERIMENTAL] Use either local JAR or remote server for preview
 
 # Enable the major mode
 
@@ -88,6 +89,27 @@ Then you can edit a `plantuml` code block with `plantuml-mode` by hitting `C-'`
 
 When in the `plantuml-mode` buffer you can then hit again `C-'` to return to the original `org-mode` document.
 
+# Execution modes
+
+**EXPERIMENTAL**
+
+As of `v1.3.0` support is added for switching execution mode. The following two modes are available:
+
+- `jar` (default) to run PlantUML as a local JAR file. This is the traditional system used by `plantuml-mode`
+- `server` (experimental) to let an instance of [`plantuml-server`](https://github.com/plantuml/plantuml-server) render the preview
+
+You can customize `plantuml-default-exec-mode` or run `plantuml-set-exec-mode` from a `plantuml-mode` buffer to switch modes.
+
+## Configure server rendering
+
+When selecting `server` execution modes, you can customize the following variable to set the server to use for rendering:
+
+```
+plantuml-server-url
+```
+
+It defaults to `"https://www.plantuml.com/plantuml"`.
+
 # Migration from `puml-mode`
 
 If you were previously using `puml-mode`, you should change any reference to a `puml-..` variable or function to its `plantuml-..` counterpart. Most notably, `puml-plantuml-jar-path` is now just `plantuml-jar-path`.

plantuml-mode.el

@@ -37,6 +37,7 @@
 
 ;;; Change log:
 ;;
+;; version 1.3.0, 2019-05-31 Added experimental support for multiple rendering modes and, specifically, preview using a PlantUML server
 ;; version 1.2.11, 2019-04-09 Added `plantuml-download-jar'
 ;; version 1.2.10, 2019-04-03 Avoid messing with window layouts and buffers -- courtesy of https://github.com/wailo
 ;; version 1.2.9, Revamped indentation support, now working with a greater number of keywords
@@ -111,7 +112,7 @@
   :type '(repeat string)
   :group 'plantuml)
 
-(defcustom plantuml-server-url "http://www.plantuml.com/plantuml"
+(defcustom plantuml-server-url "https://www.plantuml.com/plantuml"
   "The base URL of the PlantUML server."
   :type 'string
   :group 'plantuml)