2019.1

Numba requirements changed to be >= 0.41 due to Windows segfaults

New features

Bug fixes

• Fixed the numba lowering error from the scaling check for ddof not in (0, 1)

Enhancements

• Now testing all PRs on python 3.5, 3.6 and 3.7 on Linux and Windows, and 3.7-dev on linux
• Travis CI using Xenial instead of Trusty to get python 3.7 support