comonentWillMount deprecated

[sim1camporeale]

Hi
using expo 36.0.0 and there is such warning

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: Dial

according to official documentation https://en.reactjs.org/docs/react-component.html#unsafe_componentwillmount componentWillMount is deprecated.

[maxwellray]

created pr #10