Readme fix

[mavaylon1]

Motivation

What was the reasoning behind this change? Please explain the changes briefly.

How to test the behavior?

Show how to reproduce the new behavior (can be a bug fix or a new feature)

Checklist

• Did you update CHANGELOG.md with your changes?
• Have you checked our Contributing document?
• Have you ensured the PR clearly describes the problem and the solution?
• Is your contribution compliant with our coding style? This can be checked running flake8 from the source directory.
• Have you checked to ensure that there aren't other open Pull Requests for the same change?
• Have you included the relevant issue number using "Fix #XXX" notation where XXX is the issue number? By including "Fix #XXX" you allow GitHub to close issue #XXX when the PR is merged.

[codecov]

Codecov Report

Merging #1573 (124ff66) into dev (b0b6f3d) will decrease coverage by 6.90%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev    #1573      +/-   ##
==========================================
- Coverage   91.34%   84.44%   -6.91%     
==========================================
  Files          25       25              
  Lines        2507     2507              
  Branches      471      471              
==========================================
- Hits         2290     2117     -173     
- Misses        137      307     +170     
- Partials       80       83       +3     

Flag	Coverage Δ
integration	?
unit	84.44% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/pynwb/validate.py	26.04% <0.00%> (-73.96%)	⬇️
src/pynwb/io/ophys.py	45.45% <0.00%> (-54.55%)	⬇️
src/pynwb/io/misc.py	39.47% <0.00%> (-47.37%)	⬇️
src/pynwb/io/image.py	66.66% <0.00%> (-33.34%)	⬇️
src/pynwb/io/base.py	58.62% <0.00%> (-26.44%)	⬇️
src/pynwb/io/core.py	61.11% <0.00%> (-18.52%)	⬇️
src/pynwb/io/file.py	82.38% <0.00%> (-11.95%)	⬇️
src/pynwb/misc.py	87.59% <0.00%> (-3.65%)	⬇️
src/pynwb/icephys.py	89.71% <0.00%> (-2.26%)	⬇️
src/pynwb/ophys.py	94.20% <0.00%> (-1.45%)	⬇️
... and 3 more

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