need to undo change

Gemfile

@@ -7,7 +7,7 @@ gem 'systemu', '~> 2.6.5'
 gem 'adsf', '~> 1.2.0'
 gem 'sass', '~> 3.4.21'
 gem 'rdiscount', '~> 2.1.8'
-gem 'nokogiri', '~> 1.12.5'
+gem 'nokogiri', '~> 1.10.8'
 gem 'feedjira', '~> 2.0.0'
 gem 'ri_cal', '~> 0.8.8'
 gem 'rqrcode_png', '~> 0.1.5'

Gemfile.lock

@@ -1,8 +1,8 @@
 GEM
   remote: http://rubygems.org/
   specs:
-    addressable (2.8.0)
-      public_suffix (>= 2.0.2, < 5.0)
+    addressable (2.5.2)
+      public_suffix (>= 2.0.2, < 4.0)
     adsf (1.2.1)
       rack (>= 1.0.0)
     buftok (0.2.0)
@@ -80,7 +80,7 @@ GEM
     pry (0.11.3)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
-    public_suffix (4.0.6)
+    public_suffix (3.0.1)
     racc (1.5.2)
     rack (2.2.3)
     rb-fsevent (0.10.2)