Bump hamlit gem to 2.15.0

haml_lint gem has haml as dependency and hamlit
had conflicts with it:
https://github.com/k0kubun/hamlit/issues/184

The maintainer their kindly helped to resolve the issue!

Gemfile

@@ -108,7 +108,7 @@ gem 'hashie-forbidden_attributes'
 gem 'kaminari', '~> 1.0'
 
 # HAML
-gem 'hamlit', '~> 2.14.4'
+gem 'hamlit', '~> 2.15.0'
 
 # Files attachments
 gem 'carrierwave', '~> 1.3'

Gemfile.lock

@@ -592,7 +592,7 @@ GEM
       rainbow
       rubocop (>= 0.50.0)
       sysexits (~> 1.1)
-    hamlit (2.14.4)
+    hamlit (2.15.0)
       temple (>= 0.8.2)
       thor
       tilt
@@ -1461,7 +1461,7 @@ DEPENDENCIES
   gssapi
   guard-rspec
   haml_lint (~> 0.36.0)
-  hamlit (~> 2.14.4)
+  hamlit (~> 2.15.0)
   hangouts-chat (~> 0.0.5)
   hashie
   hashie-forbidden_attributes