Fix CVE-2015-1820 from rest-client

Author: tmilewski

Gemfile

@@ -8,7 +8,7 @@ group :test do
   gem "json", :platforms => %i[jruby ruby_18 ruby_19]
   gem "mime-types", "~> 1.25", :platforms => %i[jruby ruby_18]
   gem "rack-test"
-  gem "rest-client", "~> 1.7.3", :platforms => %i[jruby ruby_18]
+  gem "rest-client", "~> 1.8.0", :platforms => %i[jruby ruby_18]
   gem "rspec", "~> 3.2"
   gem "rubocop", ">= 0.51", :platforms => %i[ruby_19 ruby_20 ruby_21 ruby_22 ruby_23 ruby_24]
   gem "simplecov", ">= 0.9"