Fix typo in gemspec file

Author: nettofarah

graphql-query-resolver.gemspec

@@ -9,7 +9,7 @@ Gem::Specification.new do |spec|
   spec.authors       = ["nettofarah"]
   spec.email         = ["nettofarah@gmail.com"]
 
-  spec.summary       = %q{Minimized N+1 queries generated by GraphQL}
+  spec.summary       = %q{Minimize N+1 queries generated by GraphQL}
   spec.description   = %q{GraphQL::QueryResolver is an add-on to graphql-ruby that allows your field resolvers to minimize N+1 SELECTS issued by ActiveRecord. }
   spec.homepage      = "https://github.com/nettofarah"
   spec.license       = "MIT"