Update react-dom in / from 16.2.0 to 16.3.2

[dependencies]

Dependencies.io has updated react-dom (a npm dependency in /) from "16.2.0" 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)