restructured readme and added changelog

updated to match release notes

fixed contributors' names

complete refactor of readme into separate files, yay for documentation! 🎆

added release tag links

restructured text was janky, fixed the menu

line break by the version badges

CHANGELOG.rst

@@ -0,0 +1,39 @@
+=============
+RTV Changelog
+=============
+
+.. _1.2.1: http://github.com/michael-lazar/rtv/releases/tag/v1.2.1
+.. _1.2: http://github.com/michael-lazar/rtv/releases/tag/v1.2
+
+------
+1.2.1_
+------
+Bugfixes
+* Fixed crashing on invalid subreddit names
+
+----
+1.2_
+----
+Features
+
+* Added user login / logout with the `u` key.
+* Added subreddit searching with the `f` key.
+* Added submission posting with the `p` key.
+* Added viewing of user submissions with `/r/me`.
+* Program title now displays in the terminal window.
+* Gold symbols now display on guilded comments and posts.
+* Moved default config location to XDG_CONFIG_HOME.
+
+Bugfixes
+
+* Improved error handling for submission / comment posts.
+* Fixed handling of unicode flairs.
+* Improved displaying of the help message and selfposts on small terminal windows.
+* The author's name now correctly highlights in submissions
+* Corrected user agent formatting.
+* Various minor bugfixes.
+
+---
+1.1
+---
+* Post comments using your text editor.