Merge pull request #4813 from shuujii/remove-unneeded-dependency-from-mruby-hash-ext

Remove unneeded dependency from `mruby-hash-ext`

mrbgems/mruby-hash-ext/mrbgem.rake

@@ -2,6 +2,5 @@ MRuby::Gem::Specification.new('mruby-hash-ext') do |spec|
   spec.license = 'MIT'
   spec.author  = 'mruby developers'
   spec.summary = 'Hash class extension'
-  spec.add_dependency 'mruby-enum-ext', core: 'mruby-enum-ext'
   spec.add_dependency 'mruby-array-ext', core: 'mruby-array-ext'
 end