Update react-dom in /modules/frontend from 16.3.0 to 16.3.2

[ghost]

Dependencies.io has updated react-dom (a npm dependency in /modules/frontend) from "16.3.0" to "16.3.2".

16.3.2

React

• Improve the error message when passing null or undefined to React.cloneElement. (nicolevy in #12534)

React DOM

• Fix an IE crash in development when using <StrictMode>. (bvaughn in #12546)
• Fix labels in User Timing measurements for new component types. (bvaughn in #12609)
• Improve the warning about wrong component type casing. (nicolevy in #12533)
• Improve general performance in development mode. (gaearon in #12537)
• Improve performance of the experimental unstable_observedBits API with nesting. (gaearon in #12543)

React Test Renderer

• Add a UMD build. (bvaughn in #12594)

[codecov-io]

Codecov Report

Merging #128 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #128   +/-   ##
=======================================
  Coverage   78.16%   78.16%           
=======================================
  Files          32       32           
  Lines         284      284           
  Branches       39       39           
=======================================
  Hits          222      222           
  Misses         49       49           
  Partials       13       13

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