Bump autoprefixer-rails

Gemfile

@@ -56,7 +56,7 @@ gem "rack-cors", "1.0.2", require: "rack/cors"
 
 # CSS
 
-gem "autoprefixer-rails",     "8.2.0"
+gem "autoprefixer-rails",     "8.6.5"
 gem "bootstrap-sass",         "3.3.7"
 gem "bootstrap-switch-rails", "3.3.3"
 gem "compass-rails",          "3.0.2"

Gemfile.lock

@@ -61,7 +61,7 @@ GEM
       unf
     ast (2.4.0)
     attr_required (1.0.1)
-    autoprefixer-rails (8.2.0)
+    autoprefixer-rails (8.6.5)
       execjs
     bcrypt (3.1.12)
     bindata (2.4.3)
@@ -768,7 +768,7 @@ DEPENDENCIES
   acts_as_api (= 1.0.1)
   addressable (= 2.5.2)
   asset_sync (= 2.5.0)
-  autoprefixer-rails (= 8.2.0)
+  autoprefixer-rails (= 8.6.5)
   bootstrap-sass (= 3.3.7)
   bootstrap-switch-rails (= 3.3.3)
   capybara (= 2.18.0)