Prepare release for version 1.3.0 (#77)

@pedro-ricardo could you please check out this branch and update the changelog to contain the latest fixed documented.
After that is done I can release the new version in the marketplace.

Author: krvajal

CHANGELOG.md

@@ -8,12 +8,11 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ## [1.3.0] - 2018-06-18
 
 ### Fixed
-* 
-* 
+* Subroutine symbol list was failing with more than one line arguments (#71)
+* Minor syntax highlighting issues (#62, #73)
 
 ## Added 
-* 
-*  
+* Implementation of OpenMP directives highlighting (#17)
 
 ## [1.2.0] - 2018-05-25