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] <support@github.com>

Gemfile.lock

@@ -21,7 +21,7 @@ GEM
     mini_portile2 (2.4.0)
     nokogiri (1.10.5)
       mini_portile2 (~> 2.4.0)
-    rake (10.5.0)
+    rake (13.0.1)
     rspec (3.9.0)
       rspec-core (~> 3.9.0)
       rspec-expectations (~> 3.9.0)

spreadshot.gemspec

@@ -32,7 +32,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency "rubyXL", "~> 3.3.33"
 
   spec.add_development_dependency "bundler", "~> 2.0"
-  spec.add_development_dependency "rake", "~> 10.0"
+  spec.add_development_dependency "rake", "~> 13.0"
   spec.add_development_dependency "byebug", "~> 11.0"
   spec.add_development_dependency "rspec", "~> 3.0"
   spec.add_development_dependency "coveralls"