React

• You can now assign propTypes to components returned by React.ForwardRef. (bvaughn in #12911)

React DOM

• Fix a crash when the input type changes from some other types to text. (spirosikmd in #12135)
• Fix a crash in IE11 when restoring focus to an SVG element. (ThaddeusJiang in #12996)
• Fix a range input not updating in some cases. (Illu in #12939)
• Fix input validation triggering unnecessarily in Firefox. (nhunzaker in #12925)
• Fix an incorrect event.target value for the onChange event in IE9. (nhunzaker in #12976)
• Fix a false positive error when returning an empty <React.Fragment /> from a component. (philipp-spiess in #12966)

React DOM Server

• Fix an incorrect value being provided by new context API. (ericsoderberghp in #12985, gaearon in #13019)

React Test Renderer

• Allow multiple root children in test renderer traversal API. (gaearon in #13017)
• Fix getDerivedStateFromProps() in the shallow renderer to not discard the pending state. (fatfisz in #13030)