Update CHANGELOG.md

CHANGELOG.md

@@ -1,6 +1,12 @@
 ## Contributors
 
 
+## General
+
+- Travis now runs [shellcheck](https://github.com/koalaman/shellcheck) on every commit and pull request.
+    - We've had to exclude around 10 lint errors, see this wiki page for why we did this:
+    - https://github.com/dylanaraps/neofetch/wiki/Shellcheck-Exclusions
+
 ## Images
 
 - [iTerm2] Fixed blank images.