Relax Bundler dependency

Author: davidstosik

rspec_api_documentation.gemspec

@@ -18,7 +18,7 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency "activesupport", ">= 3.0.0"
   s.add_runtime_dependency "mustache", "~> 1.0", ">= 0.99.4"
 
-  s.add_development_dependency "bundler", "~> 1.0"
+  s.add_development_dependency "bundler", ">= 1.16"
   s.add_development_dependency "fakefs", "~> 0.4"
   s.add_development_dependency "sinatra", "~> 1.4", ">= 1.4.4"
   s.add_development_dependency "aruba", "~> 0.5"