Update rake

Author: artfuldodger

natero.gemspec

@@ -21,7 +21,7 @@ Gem::Specification.new do |spec|
 
   spec.add_dependency             'httparty',             '~> 0.13'
   spec.add_development_dependency 'bundler',              '> 1.11'
-  spec.add_development_dependency 'rake',                 '~> 10.0'
+  spec.add_development_dependency 'rake',                 '>= 12.3.3'
   spec.add_development_dependency 'rspec'
   spec.add_development_dependency 'rack',                 '>= 2.0.8'
   spec.add_development_dependency 'rspec-rails'