Vulnérabilité http-proxy

https://www.npmjs.com/advisories/1486

Waiting on:

• http-proxy's fix: Issue — PR
• NPM marks it as fixed in a new version

• http-proxy-middleware version bump: Issue - PR
• webpack-dev-server version bump: https://github.com/webpack/webpack-dev-server/issues/2605

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Imported from Trello