• Address missing OIDC errors and fix a typo in the AccountSelectionRequired exception.
• Update proxy keys on CaseInsensitiveDict.update().
• Redirect errors according to OIDC's response_mode.
• Added universal wheel support.
• Added log statements to except clauses.
• According to RC7009 Section 2.1, a client should include authentication credentials when revoking its tokens.
  As discussed in #339, this is not make sense for public clients.
  However, in that case, the public client should still be checked that is infact a public client (authenticate_client_id).
• Improved prompt parameter validation.
• Added two error codes from RFC 6750.
• Hybrid response types are now be fragment-encoded.
• Added Python 3.6 to Travis CI testing and trove classifiers.
• Fixed BytesWarning issued when using a string placeholder for bytes object.
• Documented PyJWT dependency and improved logging and exception messages.
• Documentation improvements and fixes.