v1.9.0 (2022-02-20)

• Changed Version.serialize's format argument to support passing a callback. (Contributed by marnikow)
• Added ignore option to get_version(). (Contributed by marnikow)
• Added parser option to get_version().
• Added Version.parse(). (Contributed by marnikow)
• Added Version.bump(). (Contributed by marnikow)