Merge pull request EllanJiang#21 from EllanJiang/v2019.2

V2019.2.1

Merge pull request EllanJiang#20 from EllanJiang/v2019.1.1

V2019.2.0

Merge pull request EllanJiang#19 from EllanJiang/v2019.1.0

V2019.1.0

Merge pull request EllanJiang#17 from EllanJiang/v3.1.8

V3.1.8

Merge pull request EllanJiang#16 from EllanJiang/dev/v3.1.7

Dev/v3.1.7

Merge pull request EllanJiang#15 from EllanJiang/dev/v3.1.6

Dev/v3.1.6

Merge pull request EllanJiang#13 from EllanJiang/dev/v3.1.5

Dev/v3.1.5

Merge pull request EllanJiang#12 from EllanJiang/dev/v3.1.4

Dev/v3.1.4

Merge pull request EllanJiang#9 from EllanJiang/dev/v3.1.3

Dev/v3.1.3

Merge pull request EllanJiang#8 from EllanJiang/dev/v3.1.2

Dev/v3.1.2