Show code necessary to create emoji

Touch screens without `:hover` are unable to see the tooltip.

CONTRIBUTING.md

@@ -52,11 +52,11 @@ in the proper package's repository.
   * Use the present tense
   * Reference issues and pull requests liberally
   * Consider starting the commit message with an applicable emoji:
-    * :lipstick: when improving the format/structure of the code
-    * :racehorse: when improving performance
-    * :non-potable_water: when plugging memory leaks
-    * :memo: when writing docs
-    * :penguin: when fixing something on Linux
+    * :lipstick: `:lipstick:` when improving the format/structure of the code
+    * :racehorse: `:racehorse:` when improving performance
+    * :non-potable_water: `:non-potable_water:` when plugging memory leaks
+    * :memo: `:memo:` when writing docs
+    * :penguin: `:penguin:` when fixing something on Linux
 
 ## CoffeeScript Styleguide