Upgrade react.#310

floitsch wants to merge 2 commits intofloitsch/upgrade-version.40.recent-node-versiontoitware/web-toitdocs:floitsch/upgrade-version.40.recent-node-versionfrom

floitsch/upgrade-version.50.reacttoitware/web-toitdocs:floitsch/upgrade-version.50.reactCopy head branch name to clipboard