Add a proper changelog file

CHANGELOG.md

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+# Changelog
+
+## Unreleased
+
+## 0.2.1
+
+### ⚡️ Added
+
+* HackerNews widget is now scrollable - @anandsudhir
+
+### 🐞 Fixed
+
+* Twitter screen name now configurable in configuration file - @senorprogrammer
+* Gerrit module no longer dies if it can't connect to the server - @anandsudhir
+* Pretty Weather properly displays colours again - @bertl4398 ([#298](https://github.com/senorprogrammer/wtf/issues/298))
+* Clocks row colour configuration fixed - @anandsudhir ([#282](https://github.com/senorprogrammer/wtf/issues/282))
+* Sigils no longer display when there's only one option - @anandsudhir ([#291](https://github.com/senorprogrammer/wtf/issues/291))
+* Jira module now responds to the "/" key - @senorprogrammer ([#268](https://github.com/senorprogrammer/wtf/issues/268))
+
+## 0.2.0
+
+### ⚡️ Added
+
+* [HackerNews module](https://wtfutil.com/modules/hackernews/) added - @anandsudhir
+* [Twitter module](https://wtfutil.com/modules/twitter/) added - @Trinergy
+
+### 🐞 Fixed
+
+* TravisCI module now works with Pro version thanks to @ruggi
+* Sensitive credentials can now be stored in config.yml instead of ENV vars
+* GCal.showDeclined config added by @baustinanki
+* Gerrit widget is now interactive, added by @anandsudhir
+
+---
+
+This file attempts to adhere to the principles of [keep a changelog](https://keepachangelog.com/en/1.0.0/).