Update to reflect Hatchet updates

V 145

Due to how the version checks work - via sorting, not actual comparison - this previously resulted in _always_ installing sqlite3, even though it was already bundled for lower versions of python. The second version check also encompasses 3.7.0+, so there is no need to respecify the check.

update bob dependency to point to internal bob-builder fork

Added this for local testing because bob requires 2.7, should not be merged to master

Pin pip version used by pipenv

Add Apache Airflow 1.10 Support

Update travis setup for Hatchet