v2.0.0

Changes

• BREAKING CHANGE - Fix [#94]: Long options no longer bind
  implicit arguments through substring matches.
  Before this change, the program usage: foo --foo=<arg> allowed
  passing in --foobar, which would yield --foo => "bar", which
  was found to have undesirable side-effects as explored in [#94].
  Since changing this behavior has not only follow on effects for
  users of neodoc, but also users of users, a major version bump
  was necessary.