config: exclude HAML files from Lint/Syntax cop

Rubocop's Lint/Syntax cop cannot parse HAML, causing false positives.
This excludes HAML files only from Lint/Syntax, not all cops.

Author: mroderick

.rubocop.yml

@@ -9,6 +9,10 @@ AllCops:
     - bin/**/*
     - vendor/bundle/**/*
 
+Lint/Syntax:
+  Exclude:
+    - app/views/**/*.haml
+
 plugins:
   - rubocop-capybara
   - rubocop-performance