Resolve "Missing status and mother_id in offline reader"

Closes #80 (closed)

CHANGELOG.rst

 Unreleased changes
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-
-Version 0
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 0.20.1 / 2021-03-17
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 * mother ID and status are now read out for MC tracks
 
+Version 0
+---------
+
 0.20.0 / 2021-02-18
 ~~~~~~~~~~~~~~~~~~~
 * The fields ``.tdc``, ``.pos_{xyz}`` and ``.dir_{xyz}`` in ``.hits`` are