Merge pull request #1111 from taf2/curb-update

confirmed it works with curb 1.2.2

Author: koic

lib/webmock/http_lib_adapters/curb_adapter.rb

@@ -7,7 +7,7 @@
 end
 
 if defined?(Curl)
-  WebMock::VersionChecker.new('Curb', Curl::CURB_VERSION, '0.7.16', '1.0.1', ['0.8.7']).check_version!
+  WebMock::VersionChecker.new('Curb', Curl::CURB_VERSION, '0.7.16', '1.2.2', ['0.8.7']).check_version!
 
   module WebMock
     module HttpLibAdapters