bump version of rspec to 3.4.0 ruby/rake#116

Author: Tim Hughes

Gemfile

@@ -2,7 +2,7 @@ source "https://rubygems.org"
 
 group :development, :test do
   gem 'rake'
-  gem 'rspec', "~> 3.1.0", :require => false
+  gem 'rspec', "~> 3.4.0", :require => false
   gem 'mocha', "~> 0.10.5", :require => false
   gem 'puppetlabs_spec_helper', :require => false
 end