v2.0.0

**Still a work in progress**

The next release!

Todo:
- [x] Update README
  - [x] Changelog
  - [x] Motivation section
  - [x] Update examples
  - [x] Migration guide
  - [x] Use outside of Express
- [x] Delete old test fixtures
- [x] Update manifests

After that:

- [ ] Tag the commit on Github
- [ ] Update npm