Change to remove version restriction from rake and bundler, update webmock dependency

Author: piotrmurach

github_api.gemspec

@@ -23,11 +23,11 @@ Gem::Specification.new do |gem|
   gem.add_dependency "oauth2",      "~> 1.0"
   gem.add_dependency "descendants_tracker", "~> 0.0.4"
 
-  gem.add_development_dependency "bundler",  ">= 1.5.0", "< 3"
-  gem.add_development_dependency "rake",     ">= 12.3.3", "< 14"
+  gem.add_development_dependency "bundler",  ">= 1.5.0"
+  gem.add_development_dependency "rake"
   gem.add_development_dependency "cucumber", "~> 2.1"
   gem.add_development_dependency "rspec",    "~> 3"
   gem.add_development_dependency "rspec-its","~> 1"
   gem.add_development_dependency "vcr",      "~> 3.0.3"
-  gem.add_development_dependency "webmock",  "~> 3.0.1"
+  gem.add_development_dependency "webmock",  "~> 3.8"
 end