Addressed issues #2 #3 #4. Added syntax colors based on graphql.org

Commited previous versions, just because.

Author: sogko

2016-04-19/graphql-shorthand-notation-cheat-sheet.pdf

@@ -11,12 +11,17 @@ Original article available at: https://wehavefaces.net/graphql-shorthand-notatio
 - [PNG](https://raw.githubusercontent.com/sogko/graphql-shorthand-notation-cheat-sheet/master/graphql-shorthand-notation-cheat-sheet.png)
 
 ## Release notes
+__28 Jan 2017__
+ - Fixes issue [#4](https://github.com/sogko/graphql-shorthand-notation-cheat-sheet/issues/4): Fixed typo in `enum` example.
+ - Fixes issue [#3](https://github.com/sogko/graphql-shorthand-notation-cheat-sheet/issues/3): Added `comments` example.
+ - Fixes issue [#2](https://github.com/sogko/graphql-shorthand-notation-cheat-sheet/issues/2): Added `schema` type.
+
 __10 Jun 2016__
- - Fixes issue [#1](https://github.com/sogko/graphql-shorthand-notation-cheat-sheet/issues/1): `[Users]` should be `[User]`
+ - Fixes issue [#1](https://github.com/sogko/graphql-shorthand-notation-cheat-sheet/issues/1): `[Users]` should be `[User]`.
 
 __19 Apr 2016__
- - Updated title to "GraphQL Schema Language Cheat Sheet", as advised by @leeb
- - Updated `enum` example
+ - Updated title to "GraphQL Schema Language Cheat Sheet", as advised by @leeb.
+ - Updated `enum` example.
 
 __18 Apr 2016__
-- First draft release
+- First draft release.