* Notifications unique indexes that take null values into account
* Specify import options for reaction notifications according to the indexes
* Fix specs: notifications have either user_id or organization_id
* Create notifications indexes concurrently
* Added prettier for front-end code formatting.
* Prettier runs on JSX too now
Modified supported extensions for running prettier.
* Added some documentation in the README about prettier, husky and lint-staged.
* package-lock.json updated.
* Keep lint-staged package-manager agnostic (#196)
* Remove code-breaking comma
