fixes typos on readme. removes erroneous comma after last key/value pair in ruby hash.
fixes typos on readme. removes erroneous comma after last key/value pair in ruby hash.

aws/aws-sdk-ruby,cjyclaire/aws-sdk-ruby,takeyuweb/aws-sdk-ruby,takeyuweb/aws-sdk-ruby,llooker/aws-sdk-ruby,cjyclaire/aws-sdk-ruby,takeyuweb/aws-sdk-ruby,aws/aws-sdk-ruby,cjyclaire/aws-sdk-ruby,hamadata/aws-sdk-ruby,aws/aws-sdk-ruby,llooker/aws-sdk-ruby,hamadata/aws-sdk-ruby,hamadata/aws-sdk-ruby,llooker/aws-sdk-ruby