Allow using hashie 4.x

Author: davidtaylorhq

zendesk_api.gemspec

@@ -27,7 +27,7 @@ Gem::Specification.new do |s|
  s.required_rubygems_version = ">= 1.3.6"
 
  s.add_runtime_dependency "faraday", ">= 0.9.0", "< 2.0.0"
- s.add_runtime_dependency "hashie", ">= 3.5.2", "< 4.0.0"
+ s.add_runtime_dependency "hashie", ">= 3.5.2", "< 5.0.0"
  s.add_runtime_dependency "inflection"
  s.add_runtime_dependency "multipart-post", "~> 2.0"
  s.add_runtime_dependency "mime-types"