Prepare to release 3.0.2

Merge remote-tracking branch 'origin/master'

Deprecate Double to String (#220)

* Deprecate Double to String

* Fix unit test

* Prepare to release 1.9.7

[maven-release-plugin] copy for tag 3.0.0

[maven-release-plugin] copy for tag 2.4.9

[maven-release-plugin] copy for tag 2.4.8

[maven-release-plugin] copy for tag 1.9.6

[maven-release-plugin] copy for tag 2.4.7

[maven-release-plugin] copy for tag 1.9.5

[maven-release-plugin] copy for tag 2.4.6