chore(gemspec): remove coffee-rails max version restriction for Rails 6 support

Author: kpheasey

lib/rails_script/version.rb

@@ -1,3 +1,3 @@
 module RailsScript
-  VERSION = '2.0.3'
+  VERSION = '2.0.4'
 end

rails_script.gemspec

@@ -21,5 +21,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'bundler', '~> 1.6'
   spec.add_development_dependency 'rake', '~> 0'
 
-  spec.add_dependency 'coffee-rails', '~> 4.0', '>= 4.0.0'
+  spec.add_dependency 'coffee-rails', '>= 4.0.0'
 end