Fix issue with NPM 7 throwing error

[jaworek]

NPM 7 automatically installs peer dependencies. Trying to update to React 17 causes error when installing @ant-design/icons
More info here: https://github.blog/2020-10-13-presenting-v7-0-0-of-the-npm-cli/

Based on the advice from Kent C. Dodds and Cory House, I updated peer dependency of React to be ">= 16.9.0"
Tweets: https://mobile.twitter.com/kentcdodds/status/1325565636303482880

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[codecov]

Codecov Report

Merging #216 (3e99854) into master (fc01ed2) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #216   +/-   ##
=======================================
  Coverage   99.89%   99.89%           
=======================================
  Files          13       13           
  Lines         921      921           
  Branches      199      199           
=======================================
  Hits          920      920           
  Misses          1        1           

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