Bump metaflow version to 2.0.1 in preparation for release (Netflix#63)

Release notes -

1. Handle Keyboard interrupts for Batch jobs more gracefully
2. Revamp the `metaflow configure aws` command to address usability
   issues
3. Introduce `metaflow configure [import|export]` to share configurations
4. Fix docker registry parsing logic to handle namespace better
5. Fix typos in tutorials

Initial commit for Open Source release

See docs at https://docs.metaflow.org