Add development deps needed for rake spec.

Author: Kartik Null Cating-Subramanian

kitchen-hyperv.gemspec

@@ -22,6 +22,10 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "bundler", "~> 1.7"
   spec.add_development_dependency "rake", "~> 10.0"
   spec.add_development_dependency "pry", "~> 0.10"
+  spec.add_development_dependency "cane"
+  spec.add_development_dependency "finstyle"
+  spec.add_development_dependency "rubocop"
+  spec.add_development_dependency "yard"
 
   spec.add_dependency "test-kitchen", "~> 1.4"
 end