Bump sass-rails from 5.1.0 to 6.0.0

Gemfile

@@ -15,7 +15,7 @@ gem 'hashie', '~> 4.1.0'
 gem 'jquery-rails', '~> 4.4.0'
 gem 'puma', '~> 3.12.6'
 gem 'rails_admin', '~> 2.1.1'
-gem 'sass-rails', '~> 5.1.0'
+gem 'sass-rails', '~> 6.0.0'
 gem 'validates_formatting_of', '~> 0.9.0'
 
 group :development do

Gemfile.lock

@@ -310,17 +310,8 @@ GEM
       rspec-support (~> 3.10)
     rspec-support (3.10.2)
     rubyzip (2.3.0)
-    sass (3.7.4)
-      sass-listen (~> 4.0.0)
-    sass-listen (4.0.0)
-      rb-fsevent (~> 0.9, >= 0.9.4)
-      rb-inotify (~> 0.9, >= 0.9.7)
-    sass-rails (5.1.0)
-      railties (>= 5.2.0)
-      sass (~> 3.1)
-      sprockets (>= 2.8, < 4.0)
-      sprockets-rails (>= 2.0, < 4.0)
-      tilt (>= 1.1, < 3)
+    sass-rails (6.0.0)
+      sassc-rails (~> 2.1, >= 2.1.1)
     sassc (2.4.0)
       ffi (~> 1.9)
     sassc-rails (2.1.2)
@@ -342,7 +333,7 @@ GEM
     spring (2.1.1)
     spring-commands-rspec (1.0.4)
       spring (>= 0.9.1)
-    sprockets (3.7.2)
+    sprockets (4.0.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     sprockets-rails (3.2.2)
@@ -409,7 +400,7 @@ DEPENDENCIES
   rails_12factor (~> 0.0.3)
   rails_admin (~> 2.1.1)
   rspec-rails (~> 5.0.1)
-  sass-rails (~> 5.1.0)
+  sass-rails (~> 6.0.0)
   selenium-webdriver (~> 3.142.7)
   simplecov (= 0.21.2)
   spring (~> 2.1.1)