Updated hoaxt-backend/requirements.txt to require scrapy>=1.5.1.
Updated CHANGELOG.md to reflect major change of Python 2 -> Python 3, incremented from v0.1.0-r to v0.1.1-r.
Updated READMEmd to reflect intentions to test hoaxy under Python 3; we'll certainly revise this after we actually test for Python 3 and before we merge with the master branch.