niceql.gemspec in niceql-0.1.16 vs niceql.gemspec in niceql-0.1.17

@@ -32,6 +32,7 @@
 
   spec.add_development_dependency "bundler", "~> 1.15"
   spec.add_development_dependency "rake", "~> 10.0"
   spec.add_development_dependency "minitest", "~> 5.0"
 
+  spec.add_development_dependency 'differ'
 end