Resolve "Missing status and mother_id in offline reader"

Closes #80 (closed)

CHANGELOG.rst

 Unreleased changes
 ------------------
 * ``km3net-dataformat`` updated to 2.0.0
+* mother ID and status are now read out for MC tracks
 
 Version 0
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+
 0.20.0 / 2021-02-18
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 * The fields ``.tdc``, ``.pos_{xyz}`` and ``.dir_{xyz}`` in ``.hits`` are