Use HTTPClient instead of Net::HTTP

google-api-client.gemspec

@@ -26,5 +26,6 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency 'hurley', '~> 0.1'
   spec.add_runtime_dependency 'googleauth', '~> 0.5'
   spec.add_runtime_dependency 'thor', '~> 0.19'
+  spec.add_runtime_dependency 'httpclient', '~> 2.7'
   spec.add_runtime_dependency 'memoist', '~> 0.11'
 end