Update rake requirement from ~> 10.0 to ~> 13.0

Updates the requirements on [rake](https://github.com/ruby/rake) to permit the latest version.
- [Release notes](https://github.com/ruby/rake/releases)
- [Changelog](https://github.com/ruby/rake/blob/master/History.rdoc)
- [Commits](ruby/rake@v10.5.0...v13.0.1)

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -67,7 +67,7 @@ GEM
       pry (~> 0.10)
     rack (2.2.3)
     rainbow (3.0.0)
-    rake (10.5.0)
+    rake (13.0.1)
     rspec (3.7.0)
       rspec-core (~> 3.7.0)
       rspec-expectations (~> 3.7.0)
@@ -131,7 +131,7 @@ DEPENDENCIES
   opal-rspec
   pry
   pry-byebug
-  rake (~> 10.0)
+  rake (~> 13.0)
   rspec
   rubocop
   simplecov

coltrane.gemspec

@@ -38,5 +38,5 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency 'color',       '~> 1.8'
   spec.add_runtime_dependency 'activesupport', '> 5.2'
   spec.add_development_dependency "bundler",   '~> 1.14'
-  spec.add_development_dependency "rake",      '~> 10.0'
+  spec.add_development_dependency "rake",      '~> 13.0'
 end