Rubocop fixes and removal of Ruby 1.8.7 compat

Vagrantfile

@@ -4,7 +4,6 @@
 VAGRANTFILE_API_VERSION = '2'
 
 Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
-
   config.vm.box = 'chef/centos-6.6'
   config.vm.box_download_checksum = true
   config.vm.box_download_checksum_type = 'md5'

bin/check-uchiwa-health.rb

@@ -27,7 +27,6 @@
 #   for details.
 #
 
-require 'rubygems' if RUBY_VERSION < '1.9.0'
 require 'sensu-plugin/check/cli'
 require 'net/http'
 require 'net/https'

sensu-plugins-uchiwa.gemspec

@@ -3,7 +3,6 @@ $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 
 require 'date'
 
-
 if RUBY_VERSION < '2.0.0'
   require 'sensu-plugins-uchiwa'
 else
@@ -15,7 +14,7 @@ pvt_key = '~/.ssh/gem-private_key.pem'
 Gem::Specification.new do |s|
   s.name                   = 'sensu-plugins-uchiwa'
   s.version                = SensuPluginsUchiwa::VERSION
-  s.authors                = ["Yieldbot, Inc. and contributors"]
+  s.authors                = ['Yieldbot, Inc. and contributors']
   s.email                  = '<[email protected]>'
   s.homepage               = 'https://github.com/sensu-plugins/sensu-plugins-uchiwa'
   s.summary                = ''
@@ -25,8 +24,8 @@ Gem::Specification.new do |s|
   s.files                  = Dir.glob('{bin,lib}/**/*') + %w(LICENSE README.md CHANGELOG.md)
   s.executables            = s.files.grep(%r{^bin/}) { |f| File.basename(f) }
   s.test_files             = s.files.grep(%r{^(test|spec|features)/})
-  s.require_paths          = ["lib"]
-  s.cert_chain             = ["certs/sensu-plugins.pem"]
+  s.require_paths          = ['lib']
+  s.cert_chain             = ['certs/sensu-plugins.pem']
   s.signing_key            = File.expand_path(pvt_key) if $PROGRAM_NAME =~ /gem\z/
   s.platform               = ruby
   s.required_ruby_version  = '>= 1.9.3'