add hint about reporting bugs

Author: glensc

README.md

@@ -15,3 +15,8 @@ Downloads
 Source code and downloads are available at GitHub mirror <https://github.com/pld-linux/vim-syntax-vcl/>
 
 The master repo for this code is at <http://git.pld-linux.org/packages/vim-syntax-vcl/>
+
+Reporting Bugs
+--------------
+
+Bugs should be reported to [github issue tracker](https://github.com/pld-linux/vim-syntax-spec/issues).