refactor, define Dockerfile protocol

0.1.7

release 0.1.7

flatten args

0.1.6

release 0.1.6

fix a bug in resolving args

0.1.5

release 0.1.5

dockerfile-str added

0.1.4

release 0.1.4

change valid? signature

change valid? signature

add valid?

0.1.2

release 0.1.2

first release

0.1.1

release 0.1.1