Update react-modal to 3.1.0

[Hypnosphi]

Issue: #2162

[codecov]

Codecov Report

Merging #2238 into master will increase coverage by <.01%.
The diff coverage is 20%.

@@            Coverage Diff             @@
##           master    #2238      +/-   ##
==========================================
+ Coverage   22.16%   22.16%   +<.01%     
==========================================
  Files         268      268              
  Lines        5875     5878       +3     
  Branches      707      713       +6     
==========================================
+ Hits         1302     1303       +1     
- Misses       4024     4042      +18     
+ Partials      549      533      -16

Impacted Files	Coverage Δ
lib/ui/src/modules/ui/components/search_box.js	80% <20%> (-4.38%)	⬇️
app/vue/src/server/config/babel.js	0% <0%> (-100%)	⬇️
app/vue/src/server/babel_config.js	0% <0%> (-77.42%)	⬇️
app/vue/src/server/utils.js	0% <0%> (-53.58%)	⬇️
addons/knobs/src/KnobStore.js	9.09% <0%> (ø)	⬆️
addons/knobs/src/components/PropForm.js	9.09% <0%> (ø)	⬆️
lib/ui/src/modules/ui/configs/init_panels.js	25% <0%> (ø)	⬆️
addons/knobs/src/react/WrapStory.js	19.54% <0%> (ø)	⬆️
lib/ui/src/modules/api/actions/api.js	50.47% <0%> (ø)	⬆️
lib/ui/src/modules/ui/containers/layout.js	12.5% <0%> (ø)	⬆️
... and 24 more

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[danielduan]

this should bring us to full react 16 compatibility right?

[Hypnosphi]

We are fully compatible as is, this just removes one of the peerDependency warnings and makes use of the new renderPortal feature when it’s available