bump autoprefixer-rails

Gemfile.lock

@@ -388,7 +388,6 @@ GEM
     multi_test (0.1.1)
     multi_xml (0.5.5)
     multipart-post (2.0.0)
-    mysql2 (0.3.18)
     nenv (0.2.0)
     nested_form (0.3.2)
     net-scp (1.2.1)
@@ -430,6 +429,7 @@ GEM
       faraday (~> 0.9.0)
       nokogiri (~> 1.6)
     orm_adapter (0.5.0)
+    pg (0.18.1)
     phantomjs (1.9.8.0)
     pry (0.10.1)
       coderay (~> 1.1.0)
@@ -727,7 +727,6 @@ DEPENDENCIES
   mini_magick (= 4.1.0)
   minitest
   mobile-fu (= 1.3.1)
-  mysql2 (= 0.3.18)
   nokogiri (= 1.6.6.2)
   omniauth (= 1.2.2)
   omniauth-facebook (= 1.6.0)
@@ -735,6 +734,7 @@ DEPENDENCIES
   omniauth-twitter (= 1.0.1)
   omniauth-wordpress (= 0.2.1)
   open_graph_reader (= 0.4.0)
+  pg (= 0.18.1)
   pry
   pry-byebug
   pry-debundle

browserlist

+last 2 version
+> 1%

config/autoprefixer.yml

-browsers:
-  - "last 2 version"
-  - "> 1%"