gemspec.erb in gapic-generator-cloud-0.1.1

- old
+ new

@@ -29,10 +29,10 @@
   gem.add_dependency "grpc-google-iam-v1", "~> 0.6.9"
   <%- end -%>
 
   gem.add_development_dependency "google-style", "~> 1.24.0"
   gem.add_development_dependency "minitest", "~> 5.10"
-  gem.add_development_dependency "rake", "~> 12.0"
+  gem.add_development_dependency "rake", ">= 12.0"
   gem.add_development_dependency "redcarpet", "~> 3.0"
   gem.add_development_dependency "simplecov", "~> 0.18"
   gem.add_development_dependency "yard", "~> 0.9"
 end