Upgrade pandas min version

[rly]

Motivation

Fix #617

Checklist

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[codecov]

Codecov Report

Merging #618 (60345b4) into dev (db51148) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #618   +/-   ##
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  Coverage   86.13%   86.13%           
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  Files          41       41           
  Lines        8237     8237           
  Branches     1775     1775           
=======================================
  Hits         7095     7095           
  Misses        811      811           
  Partials      331      331           

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[rly]

@ajtritt Do you think this merits a bugfix release (in both hdmf and pynwb)? See also conda-forge/pynwb-feedstock#37

[ajtritt]

@rly

Do you think this merits a bugfix release (in both hdmf and pynwb)?

If I understand things correctly, the latest PyNWB will not install. Is that right? If so, I then a bugfix release seems appropriate.

[rly]

@rly

Do you think this merits a bugfix release (in both hdmf and pynwb)?

If I understand things correctly, the latest PyNWB will not install. Is that right? If so, I then a bugfix release seems appropriate.

I answered over Slack, but for completeness, the latest PyNWB will not run correctly if pandas==0.25 and numpy==1.20. And conda-forge tests fail, preventing a PyNWB release on conda, because their CI environment happens to have pandas==0.25 and numpy==1.20.