Update webmock to version 3.14.0

Author: depfu[bot]

oauth.gemspec

@@ -44,7 +44,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency("typhoeus", ">= 0.1.13")
   spec.add_development_dependency("em-http-request", "0.2.11")
   spec.add_development_dependency("curb")
-  spec.add_development_dependency("webmock", "< 2.0")
+  spec.add_development_dependency("webmock", "<= 3.14.0")
   spec.add_development_dependency("codeclimate-test-reporter")
   spec.add_development_dependency("simplecov")
   spec.add_development_dependency("rest-client")