Update mocha to version 1.13.0

Author: depfu[bot]

oauth.gemspec

@@ -42,7 +42,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency("em-http-request", "~> 1.1.7")
   spec.add_development_dependency("iconv")
   spec.add_development_dependency("minitest")
-  spec.add_development_dependency("mocha", ">= 0.9.12", "<=1.1.0")
+  spec.add_development_dependency("mocha", ">= 0.9.12", "<= 1.13.0")
   spec.add_development_dependency("rack", "~> 2.0")
   spec.add_development_dependency("rack-test")
   spec.add_development_dependency("rake", "~> 13.0")