message: Mention semantic highlighting in the feature list
  Also mention the "rainbow" feature and link to an article explaining it.
diff: @@ -26,6 +26,7 @@ some extra features to boot:
  * #include auto-complete, undefined type include insertion, include quick-jump
  (goto definition, document links)
  * auto-implement functions without a definition
  + * semantic highlighting, including support for [rainbow semantic highlighting](https://medium.com/@evnbr/coding-in-color-3a6db2743a1e)
  # Setup - build cquery, install extension, setup project
  