Running hail on AWS EMR

[tpoterba]

Just made a post about this:

ImportError: cannot import name getargspec

The author of the decorator module pushed a new version to PyPI a few days ago which removed functionality from the module without updating the major version. This means that decorator 4.3.0 will not work with Hail 0.1. To fix this, use: pip install decorator==4.2.1