Fix corejs3 failure on fresh checkout#86

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matthargett wants to merge 3 commits intoenzymejs:masterfrom

matthargett:fix-corejs3-failure

Commits on Oct 16, 2020

This fixes the yarn build and test targets, which had the error 'Error: Cannot find module '@babel/compat-data/corejs3-shipped-proposals''
matthargett
committed
Align babel plugin versions.
matthargett
committed
Align babel plugin versions redux. For some reason, plugin-transform-classes gives an error when updated to 7.12.x.
matthargett
committed