update rspec

Author: markburns

pusher.gemspec

@@ -17,7 +17,7 @@ Gem::Specification.new do |s|
   s.add_dependency "httpclient", "~> 2.5"
   s.add_dependency "jruby-openssl" if defined?(JRUBY_VERSION)
 
-  s.add_development_dependency "rspec", "~> 2.0"
+  s.add_development_dependency "rspec", "~> 3.0"
   s.add_development_dependency "webmock"
   s.add_development_dependency "em-http-request", "~> 1.1.0"
   s.add_development_dependency "rake"