don't use foreach as droplets has only one v4 and/or v6 network value
Merge branch 'master' of github.com:toin0u/DigitalOceanV2
fix CS in droplet api
Revert "don't use foreach as droplets has only one v4 and/or v6 network value"

This reverts commit e8755bbc9fd15f112654d6416345062cec47058b.
update action doc and specs
improve doc
add region doc and specs
fix variable name in action spec
add size specs
add image specs and doc