Release 4.2.0

Added

• Add a new timeout parameter to OsmApi which allows to set a timeout in seconds (default is 30s) for the API requests (see issue #170, thanks Mateusz Konieczny)

Changed

• Only include discussion key in result of ChangesetGet if include_discussion=True (see issue #163, thanks Mateusz Konieczny)
• Update OAuth example in README using cli-oauth2 (see PR #169, thanks Ilya Zverev)