Fix missing gem dependency

Author: dashdashzako

Gemfile

@@ -2,6 +2,7 @@ source 'https://rubygems.org'
 
 gem 'jekyll', '~>3.1'
 gem 'rake'
+gem 'scss_lint'
 
 group :jekyll_plugins do
   gem 'jekyll-assets', '2.2.5'

Gemfile.lock

@@ -74,6 +74,9 @@ GEM
     rouge (1.10.1)
     safe_yaml (1.0.4)
     sass (3.4.22)
+    scss_lint (0.50.2)
+      rake (>= 0.9, < 12)
+      sass (~> 3.4.20)
     sprockets (3.6.0)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
@@ -94,6 +97,7 @@ DEPENDENCIES
   jekyll-assets (= 2.2.5)
   jekyll-sitemap
   rake
+  scss_lint
 
 BUNDLED WITH
    1.12.5