AngleBracketedParameterData has grown a new member.
AngleBracketedParameterData has grown a new member.

Fixes #54.

birkenfeld/docopt.rs,birkenfeld/docopt.rs,zsiciarz/docopt.rs,brandonson/docopt.rs,birkenfeld/docopt.rs,zsiciarz/docopt.rs,zsiciarz/docopt.rs,brandonson/docopt.rs,brandonson/docopt.rs