0.7.1

Response.redirect now merges query_params into a URL that already has a
query string instead of appending a second ? to it, so
Response.redirect("/cb?a=1", {"code": "x"}) redirects to /cb?a=1&code=x.
A fragment stays after the query, including an empty #, and a list value is
repeated as key=a&key=b rather than encoded as a Python list.

This release was contributed by @patrick91 in #21