use ruby 2.1.5

.ruby-version

@@ -1 +1 @@
-2.1.4
+2.1.5

.travis.yml

@@ -1,17 +1,21 @@
 language: ruby
+
 sudo: false
-rvm:
-- 2.1.4
+
+rvm: 2.1.5
+
 env:
   global:
-  - RUBY_GC_MALLOC_LIMIT=90000000
-  - RUBY_GC_HEAP_FREE_SLOTS=200000
+    - RUBY_GC_MALLOC_LIMIT=90000000
+    - RUBY_GC_HEAP_FREE_SLOTS=200000
+
 cache: bundler
+
 addons:
   postgresql: 9.3
+
 services:
-- redis
+  - redis
+
 before_script:
-- 'RAILS_ENV=test bundle exec rake db:create db:migrate --trace'
-notifications:
-  irc: "irc.freenode.org#travis"
+  - 'RAILS_ENV=test bundle exec rake db:create db:migrate --trace'

Gemfile

@@ -1,6 +1,8 @@
 source 'https://rubygems.org'
 gemspec
 
+ruby "2.1.5"
+
 gem 's3',              github: 'travis-ci/s3'
 
 gem 'travis-core',     github: 'travis-ci/travis-core'