Fix README
Fix README
Fix create client
Merge pull request #3 from winebarrel/fix_readme

Fix README
Merge pull request #4 from winebarrel/fix_aws_sdk_call

Fix create client
version++
Add use_tag_as_group option
Fix conflict
Fix README
Merge pull request #5 from winebarrel/add_use_tag_as_group

Add use_tag_as_group option
Bump up version.