[Nexus] NeXus definitions repository change

[Jemian, Pete R.]

NeXus community:

I plan to make a change in the NeXus definitions repository on Friday, 
2021-02-12, as described in 
https://github.com/nexusformat/definitions/issues/798.

The default branch name will be changed from "master" to "main"
following recommendations: https://github.com/github/renaming.

An additional message will be sent once this task is completed.

Regards,
     Pete

-- 
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Pete R. Jemian, Ph.D.                 <jemian at anl.gov>
Beam line Controls and Data Acquisition (BC, aka BCDA)
Advanced Photon Source,    Argonne National Laboratory
Argonne, IL  60439                    630 - 252 - 3189
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       Education is the one thing for which people
          are willing to pay yet not receive.
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