Kai Chen 12e5913bb9
Remove supports for python 2.7 and bump version to 0.4.0 (#211)
* remove supports for python 2.7

* fix the unit test for python 3.5

* add python 3.8 in CI

* try ubuntu 18.04 as the environment
2020-03-16 15:15:35 +08:00
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