Remove unmaintained changelog.md

Changelog.md

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-# Changes since 0.5.3 #
-- Moved to KDE
-- Added support for settings.
-- New secondary backend [Toasty](http://supertoasty.com/).
-- New secondary backend [Notify my Android](https://www.notifymyandroid.com/).
-- New secondary backend Sound playback.
-- New secondary backend [Pushover](https://pushover.net/) .
-- New frontend  [Pushover](https://pushover.net/).
-- OSX Notification Center now supports callbacks, thanks to [jendas1](https://github.com/jendas1).
-- Install a .pri file, it is now quite easy to use Snorenotify in a qmake project.
-- Improved implementation of build in Snore backend.
-- Dropped Qt4
-- Use c++11
-- Lots of important Api changes
-
-# Changes since 0.5.2 #
-- Updated SnoreToast
-
-# Changes since 0.5.1 #
-- Updated the shiped version of SnoreToast
-	- SnoreToast reported succes even if notifications failed because they where disabled by the system. This lead to a crash in snorenotify.
-
-# Changes since 0.5.0 #
-- Ship  a staticaly linked version of Snoretoast
-- Fix window comming to front on mac osx on snore notifications
-- Fixed creation of tmp dir on qt4
-
-# Changes since 0.5.0rc3 #
-- Readded the missing close button for the snore backend
-- Cleaned up snore backend use a QPropertyAnimation instead of a custom timer code.
-- Cleaned up qml in snore backend.
-- Some buildsystem fixes.
-
-# Changes since 0.5.0rc2 #
-- Fixed a crash related to a QTimer deleted in the wrong thread.
-
-# Changes since 0.5.0rc1 #
-- Cleanedup build system using new Cmake magic
-- Dropped KDE stuff
-- Dropeed dependencie to boost and cryptopp by switching to a different Growl implementation. [A fork of gntp-send](https://github.com/Snorenotify/SnoreGrowl).
-
-
-# Changes since 0.5.0beta4 #
-- Merged mac osx backend
-- Fixed a possible crash, if register was called directly before notify
-- Don't register snorenotify with Growl
-
-# Changes since 0.5.0beta3 #
-- Only use QTemporaryDir  in qt5
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-# Changes since 0.5.0beta2 #
-- Use  QTemporaryDir for the image cache
-- Reduce calls to QFile::exists
-
-# Changes since 0.5.0beta1 #
-- Removed plugin caching, it was overkill and caused problems if the plugins where updated.
-
-# Changes since 0.5-alpha1 #
-- Better scaling for the snore backend.
-- Fixed a crash.
-
-# Changes since 0.4 #
-- Support for separated installs for qt4 and qt5.
-- Improved logging system.
-- Extended doxygen doc.
-- Refactoring.
-- Added a default qml notification backend.
-- Improved plugin loading.
-- The Windows 8 backend now supports closing of notifications.
-....