fix quoting in ruby-build install command

Author: vcholkar

identity_ruby/recipes/default.rb

@@ -25,7 +25,7 @@
 
 #install ruby-build
 execute 'install ruby-build' do
-  command "git clone --branch #{ruby_build_version} --depth 1 https://github.com/rbenv/ruby-build.git "$(rbenv root)"/plugins/ruby-build"
+  command %(git clone --branch #{ruby_build_version} --depth 1 https://github.com/rbenv/ruby-build.git "$(rbenv root)"/plugins/ruby-build)
 end
 
 node.fetch('identity_ruby').fetch('ruby_versions').each do |version|