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Deprecated lifecycle method warnings with React 16.9 #420

@bopfer

Description

@bopfer

The following warning is shown upon upgrading to React 16.9.0:

backend.js:1 Warning: componentWillMount has been renamed, and is not recommended
for use. See https://fb.me/react-async-component-lifecycle-hooks for details.

* Move code with side effects to componentDidMount, and set initial state in the
constructor.
* Rename componentWillMount to UNSAFE_componentWillMount to suppress this warning
in non-strict mode. In React 17.x, only the UNSAFE_ name will work. To rename all
deprecated lifecycles to their new names, you can run
`npx react-codemod rename-unsafe-lifecycles` in your project source folder.

Please update the following components: Draggable

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