bump to ruby 2.3.1

.rubocop.yml

@@ -15,3 +15,5 @@ LineLength:
   Max: 160
 AbcSize:
   Enabled: false
+Style/FrozenStringLiteralComment:
+  Enabled: false

Gemfile

@@ -1,5 +1,5 @@
 source 'https://rubygems.org'
-
+ruby '2.3.1'
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '~> 4.2'
 # Use SCSS for stylesheets

Gemfile.lock

@@ -99,8 +99,10 @@ GEM
     kaminari (0.17.0)
       actionpack (>= 3.0.0)
       activesupport (>= 3.0.0)
-    kaminari-mongoid (0.1.2)
-      kaminari
+    kaminari-core (1.0.1)
+    kaminari-mongoid (1.0.1)
+      kaminari-core (~> 1.0)
+      mongoid
     loofah (2.0.3)
       nokogiri (>= 1.5.9)
     mail (2.6.4)
@@ -310,5 +312,8 @@ DEPENDENCIES
   uglifier (>= 1.3.0)
   web-console (~> 2.0)
 
+RUBY VERSION
+   ruby 2.3.1p112
+
 BUNDLED WITH
    1.14.6