Docpie

* [change] **break-change**: `[]` means anything in it is optional.


Usage: prog [-dir]


equals to


Usage: prog [-d] [-i] [-r]


If you want all elements to appear, use


Usage: prog [(-dir)]

* [fix] `Usage: prog [-v] -- <args>...` failed to match `porg -v -- -v --verb`
* [fix] [1](https://github.com/TylerTemp/docpie/issues/1) command order bug.