Add info about compiler.fileTimestamps and compiler.contextTimestamps#4150

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jeffin143 wants to merge 2 commits intowebpack:mainfrom

jeffin143:fix-4106

Commits on Nov 10, 2020

Add info about compiler.fileTimestamps and compiler.contextTimestamps
jeffin143
committed

Commits on Dec 10, 2020

Merge https://github.com/webpack/webpack.js.org into fix-4106
jeffin143
committed