hepmc3 REMOVED from testing

[Debian testing watch]

FYI: The status of the hepmc3 source package
in Debian's testing distribution has changed.

  Previous version: 3.1.2-2
  Current version:  (not in testing)
  Hint: <https://release.debian.org/britney/hints/auto-removals>
    # 1064556

The script that generates this mail tries to extract removal
reasons from comments in the britney hint files. Those comments
were not originally meant to be machine readable, so if the
reason for removing your package seems to be nonsense, it is
probably the reporting script that got confused. Please check the
actual hints file before you complain about meaningless removals.

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