Merge pull request #811 from yahonda/bump_rake

Bump rake version 13.2 or higher to suppress ostruct warnings

Author: yahonda

sprockets.gemspec

@@ -29,7 +29,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency "minitest", "~> 5.0"
   s.add_development_dependency "nokogiri", "~> 1.3"
   s.add_development_dependency "rack-test", "~> 2.0.0"
-  s.add_development_dependency "rake", "~> 12.0"
+  s.add_development_dependency "rake", "~> 13.2"
   s.add_development_dependency "sass", "~> 3.4"
   s.add_development_dependency "sassc", "~> 2.0"
   s.add_development_dependency "uglifier", ">= 2.3"