Update changelog.

changelog.markdown

@@ -1,5 +1,13 @@
-Version 0.2
-=============
+08/06/2016 - Version 0.4.0
+==========================
+
+This release has been long overdue. It may surprise you to see the high jump
+in version number, this is because the Nim installer bundled a "fake"
+version 0.3.0 up until now.
+
+There are many changes between the last release and this one. Some of them
+are outlined below. A big change for this release is the inclusion of an icon
+and a Mac OS X build.
 
 * Tabs can now be reordered.
 * Close button can now only be shown on the selected tab. (This is configurable)
@@ -33,7 +41,7 @@ the Nimrod syntax highlighter.
 * When searching, all occurrences in the document of your search will now be
   highlighted.
 * When you select text all occurrences of the selected text will now be highlighted.
-* You are now notified when search wraps around the end of the file through the 
+* You are now notified when search wraps around the end of the file through the
   status bar.
 * Compiling an unsaved file now saves it to /tmp. Aporia will warn you about any
   files which are saved in /tmp with a red ``*``. Old behaviour can be restored
@@ -43,4 +51,4 @@ the Nimrod syntax highlighter.
 * Settings are now seperated into two files: config.global.ini and config.auto.ini.
   The latter contains settings which should not be edited as they might be overwritten
   when Aporia is closed (last session info, window width/height etc.). The former
-  can be edited.
+  can be edited.