Merge pull request #10 from splitrb/dependabot/bundler/rake-tw-13.0

Update rake requirement from ~> 12.0 to ~> 13.0

Author: andrehjr

split-api.gemspec

@@ -22,5 +22,5 @@ Gem::Specification.new do |gem|
   gem.add_development_dependency 'bundler'
   gem.add_development_dependency 'rspec',       '~> 3.8.0'
   gem.add_development_dependency 'rack-test',   '~> 1.1'
-  gem.add_development_dependency 'rake',        '~> 12.0'
+  gem.add_development_dependency 'rake',        '~> 13.0'
 end