Merge pull request #609 from splitrb/dependabot/bundler/rake-tw-13

Update rake requirement from ~> 12 to ~> 13

Author: andrehjr

split.gemspec

@@ -36,7 +36,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'bundler',     '>= 1.17'
   s.add_development_dependency 'simplecov',   '~> 0.15'
   s.add_development_dependency 'rack-test',   '~> 1.1'
-  s.add_development_dependency 'rake',        '~> 12'
+  s.add_development_dependency 'rake',        '~> 13'
   s.add_development_dependency 'rspec',       '~> 3.7'
   s.add_development_dependency 'pry',         '~> 0.10'
   s.add_development_dependency 'fakeredis',   '~> 0.7'