Release 1.1.0

Make RC2

Make RC1

Bump version

Enforce only major version in JSON model schema

Change version to 1.0.0

Change version to 1.0.0rc2

Test model compatibility. (dmlc#5248)

* Add model compability tests.

* Typo.

[RFC] Version 0.90 release candidate (dmlc#4475)

* Release 0.90

* Add script to automatically generate acknowledgment

* Update NEWS.md

Release 0.82 (dmlc#4201)