Upgrade ancestry to version 3.0.1

Gemfile

@@ -5,7 +5,7 @@ gem 'rails', '4.2.10'
 gem 'acts-as-taggable-on', '~> 4.0.0'
 gem 'acts_as_votable', '~> 0.11.1'
 gem 'ahoy_matey', '~> 1.6.0'
-gem 'ancestry', '~> 2.2.2'
+gem 'ancestry', '~> 3.0.1'
 gem 'browser', '~> 2.5.2'
 gem 'cancancan', '~> 1.16.0'
 gem 'ckeditor', '~> 4.2.3'

Gemfile.lock

@@ -57,8 +57,8 @@ GEM
     akami (1.3.1)
       gyoku (>= 0.4.0)
       nokogiri
-    ancestry (2.2.2)
-      activerecord (>= 3.0.0)
+    ancestry (3.0.1)
+      activerecord (>= 3.2.0)
     arel (6.0.4)
     ast (2.3.0)
     babel-source (5.8.35)
@@ -495,7 +495,7 @@ DEPENDENCIES
   acts-as-taggable-on (~> 4.0.0)
   acts_as_votable (~> 0.11.1)
   ahoy_matey (~> 1.6.0)
-  ancestry (~> 2.2.2)
+  ancestry (~> 3.0.1)
   browser (~> 2.5.2)
   bullet (~> 5.7.0)
   byebug (~> 9.1.0)