Update ADDONS_SUPPORT.md

[getsetbro]

The viewport plugin works in angular.

Issue:

What I did

How to test

Is this testable with jest or storyshots?

Does this need a new example in the kitchen sink apps?

Does this need an update to the documentation?

If your answer is yes to any of these, please make sure to include it in your PR.

[codecov]

Codecov Report

Merging #3114 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3114   +/-   ##
=======================================
  Coverage   36.08%   36.08%           
=======================================
  Files         438      438           
  Lines        9447     9447           
  Branches      887      894    +7     
=======================================
  Hits         3409     3409           
+ Misses       5475     5468    -7     
- Partials      563      570    +7

Impacted Files	Coverage Δ
addons/actions/src/lib/util/getPropertiesList.js	60% <0%> (ø)	⬆️
...res__/update-addon-info/update-addon-info.input.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/api/index.js	0% <0%> (ø)	⬆️
.../src/modules/ui/components/stories_panel/header.js	29.62% <0%> (ø)	⬆️
...modules/ui/components/stories_panel/text_filter.js	30.98% <0%> (ø)	⬆️
.../ui/src/modules/ui/components/addon_panel/index.js	34.78% <0%> (ø)	⬆️
addons/storyshots/src/rn/loader.js	53.33% <0%> (ø)	⬆️
addons/info/src/components/markdown/code.js	76.92% <0%> (ø)	⬆️
...tories_panel/stories_tree/tree_decorators_utils.js	45.23% <0%> (ø)	⬆️
addons/viewport/src/components/SelectViewport.js	15% <0%> (ø)	⬆️
... and 60 more

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[igor-dv]

Thanks !