v0.4.0

• Adds a new param_feature macro, which wraps Wallaby's feature tests
  the same way param_test wraps ExUnit's test.

  (While you can use the plain param_test macro in a test module that
  contains use Wallaby.Feature, doing so will break some Wallaby features
  including screenshot generation on failure.)

• Moves the parse_examples/2 function, an implementation detail for the
  param_test macro, into a new private module ParameterizedTest.Parser.

Full Changelog: v0.3.1...v0.4.0