Update CHANGELOG.md for 2.2.0 release

Author: Zordrak

CHANGELOG.md

@@ -1,3 +1,12 @@
+## 2.2.0 (February 06, 2021)
+
+ * Convert GitHub CI from Travis CI to Github Actions
+ * Fix min-required after it was broken by 2.1.0 (#235)
+ * Min-required recursive lookup was dangerously broken. Removed the recursion that should never have been (#237)
+ * Fix the failure of tfenv list when no default was set (#236)
+ * Add init command (#240)
+ * Use ggrep on Mac with Homebrew (#218)
+
 ## 2.1.0 (January 30, 2021)
 
  * Update tfenv-min-required to search root before recursing (#203)