Bump haml_lint

Gemfile

@@ -241,7 +241,7 @@ group :development do
 
   # Linters
   gem "rubocop",        "0.40.0"
-  gem "haml_lint",      "0.17.1"
+  gem "haml_lint",      "0.18.1"
   gem "pronto",         "0.7.0"
   gem "pronto-eslint",  "0.7.0"
   gem "pronto-rubocop", "0.7.0"

Gemfile.lock

@@ -403,7 +403,7 @@ GEM
       rubocop (~> 0.20)
     haml (4.0.7)
       tilt
-    haml_lint (0.17.1)
+    haml_lint (0.18.1)
       haml (~> 4.0)
       rake (>= 10, < 12)
       rubocop (>= 0.36.0)
@@ -950,7 +950,7 @@ DEPENDENCIES
   guard-cucumber (= 2.1.2)
   guard-rspec (= 4.7.3)
   guard-rubocop (= 1.2.0)
-  haml_lint (= 0.17.1)
+  haml_lint (= 0.18.1)
   hamlit (= 2.5.0)
   handlebars_assets (= 0.23.0)
   http_accept_language (= 2.0.5)