Merge pull request #4 from norton073/bugfix-IDEV-622-fix-build-of-overflow-signalizer

Add version(~> 0.20) of pg gem

Author: rutaka-n

activerecord-overflow_signalizer.gemspec

@@ -22,7 +22,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ['lib']
 
   # spec.add_runtime_dependency 'activerecord', '~> 3.2'
-  spec.add_runtime_dependency 'pg'
+  spec.add_runtime_dependency 'pg', '~> 0.20'
 
   spec.add_development_dependency 'bundler', '~> 1.14'
   spec.add_development_dependency 'rake', '~> 10.0'