v0.2.0 - Updates

This release includes the following changes:

• Add onOpen prop (#39 by @hmetgundogdu).
• Add closeOnUnmount prop (#94 by @brianmspence).
• React 17 added as peer dependency (#82 by @RyanNerd).
• Use standard SPDX identifier for license (#91 by @abradley).
• Update dependencies to latest.

Happy coding!