Update changelog to comply with the github markdown spec

The 'Github Flavored Markdown' specification says that headers must be
followed by a space character, update the changelog to respect that
requirement.

CHANGELOG.md

@@ -1,7 +1,8 @@
-#Dunst changelog
+# Dunst changelog
 
-##Unreleased
-###Added
+## Unreleased
+
+### Added
 - `always_run_script` option to run script even if a notification is suppressed
 - Support for svg icon files
 - Support for raw icons
@@ -10,14 +11,14 @@
 - `markup` setting for more fine-grained control over how markup is handled
 - `history_ignore` rule action to exclude a notification from being added to the history
 
-###Changed
+### Changed
 - Text and icons are now centred vertically
 - Notifications aren't considered duplicate if urgency or icons differ
 
-###Deprecated
+### Deprecated
 - `allow_markup` will be removed in later versions. It is being replaced by `markup`
 
-###Fixed
+### Fixed
 - Infinite loop if there are 2 configuration file sections with the same name
 - URLs with dashes and underscores in them are now parsed properly
 - Many memory leaks
@@ -28,19 +29,19 @@
 - `ignore_newline` now works regardless of the markup setting
 - dmenu process being left as a zombie if no option was selected
 
-##1.1.0 - 2014-07-29
+## 1.1.0 - 2014-07-29
 - fix nasty memory leak
 - icon support (still work in progress)
 - fix issue where keybindings aren't working when numlock is activated
 
-##1.0.0 - 2013-04-15
+## 1.0.0 - 2013-04-15
 - use pango/cairo as drawing backend
 - make use of pangos ability to parse markup
 - support for actions via context menu
 - indicator for actions/urls found
 - use blocking I/O. No more waking up the CPU multiple times per second to check for new dbus messages
 
-##0.5.0 - 2013-01-26
+## 0.5.0 - 2013-01-26
 - new default dunstrc
 - frames for window
 - trigger scripts on matching notifications
@@ -49,7 +50,7 @@
 - use own code for ini parsing (this removes inih)
 - progress hints
 
-##0.4.0 - 2012-09-27
+## 0.4.0 - 2012-09-27
 - separator between notifications
 - word wrap long lines
 - real transparance
@@ -60,10 +61,10 @@
 - bugfix: forgetting geometry
 - (optional) static configuration
 
-##0.3.1 - 2012-08-02
+## 0.3.1 - 2012-08-02
 - fix -mon option
 
-##0.3.0 - 2012-07-30
+## 0.3.0 - 2012-07-30
 - full support for Desktop Notification Specification (mandatory parts)
 - option to select monitor on which notifications are shown
 - follow focus
@@ -77,7 +78,7 @@
 - cleanup / bugfixes etc.
 - added dunst.service
 
-##0.2.0 - 2012-06-26
+## 0.2.0 - 2012-06-26
 - introduction of dunstrc
 - removed static configuration via config.h
 - don't timeout when user is idle