Set up auto

[jwodder]

Closes #53.

This PR also needs to be accompanied by the following changes:

• [x] Create the necessary labels for auto by running GH_TOKEN=... auto create-labels in a copy of this repository containing .autorc
• [x] All PRs merged since the previous release should receive appropriate labels.
• [x] An auth token for uploading assets for the datalad-deprecated project to PyPI must be saved as a secret named "PYPI_TOKEN"

[codecov-commenter]

Codecov Report

Merging #54 (537f0e9) into master (d2343e7) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 537f0e9 differs from pull request most recent head b4eed41. Consider uploading reports for the commit b4eed41 to get more accurate results

@@           Coverage Diff           @@
##           master      #54   +/-   ##
=======================================
  Coverage   89.50%   89.50%           
=======================================
  Files          22       22           
  Lines        2831     2831           
=======================================
  Hits         2534     2534           
  Misses        297      297           

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[yarikoptic]

We are done on this, let's merge and try to kick out a release while at it.