Merge pull request #176 from line/dependabot/bundler/rake-tw-13.0

Update rake requirement from ~> 10.4 to ~> 13.0

Author: kimoto

line-bot-api.gemspec

@@ -21,7 +21,7 @@ Gem::Specification.new do |spec|
 
   spec.add_development_dependency "addressable", "~> 2.3"
   spec.add_development_dependency "bundler", "~> 1.11" if RUBY_VERSION < "2.3"
-  spec.add_development_dependency 'rake', "~> 10.4"
+  spec.add_development_dependency 'rake', "~> 13.0"
   spec.add_development_dependency "rspec", "~> 3.0"
   spec.add_development_dependency "webmock", "~> 3.8"
 end