Bump version, add CHANGES note

Author: adam-p

.gitignore

@@ -7,3 +7,6 @@ Thumbs.db
 
 # Build directory
 dist
+
+# Extension stub file
+markdown-here@adam.pritchard

src/common/CHANGES.md

@@ -1,6 +1,13 @@
 Change Log
 ==========
 
+2018-09-30: v2.13.4
+--------------------
+
+* Fixed [bug #524] and [bug #526]: Due to v2.13.3 fix, Markdown Here didn't work in Thunderbird with a non-English UI.
+  - Thanks to [KSR-Yasuda](https://github.com/KSR-Yasuda), [ensleep](https://github.com/ensleep), [Pedro Silva](https://github.com/pmanu93), [Christophe Meyer](https://github.com/stombi), [littdky](https://github.com/littdky), [Michael Lashkevich](https://github.com/lashkevi), [morsedl](https://github.com/morsedl).
+
+
 2018-09-11: v2.13.3
 --------------------
 

src/install.rdf

@@ -5,7 +5,7 @@
     <Description about="urn:mozilla:install-manifest">
         <em:type>2</em:type> <!-- 2 : Extension -->
         <em:id>markdown-here@adam.pritchard</em:id>
-        <em:version>2.13.3</em:version>
+        <em:version>2.13.4</em:version>
 
         <!-- Firefox -->
         <em:targetApplication>

src/manifest.json

@@ -1,7 +1,7 @@
 {
   "manifest_version": 2,
   "name": "__MSG_app_name__",
-  "version": "2.13.3",
+  "version": "2.13.4",
   "description": "__MSG_app_slogan__",
   "homepage_url": "http://markdown-here.com",
   "default_locale": "en",