Tracking v3.0.0 release items

[srprash]

Creating this issue to list items to release as part of the next major version 3.0.0. Please link any issues/PRs which are either breaking changes or major features.

• Deprecate Python2.7 and 3.4 - Deprecate support for python 2.7 and 3.4 in the next major version #255

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs in next 7 days. Thank you for your contributions.