bump v0.8.2 (OpenNMT#1310)

Bump version 0.8.1 (OpenNMT#1286)

Bump version 0.8.0 (OpenNMT#1280)

Bump minor version (OpenNMT#1243)

bump version 0.7.1 (OpenNMT#1217)

fix torch.no_grad for validation (OpenNMT#1156)

bump version

Merge pull request OpenNMT#1077 from vince62s/v0.6

Bump version 0.6

Bump version (OpenNMT#1005)

* fix raiserror on -shuffle at preprocessing + bump version

* Update CHANGELOG.md

Fix preprocess filenames + cleaning. Bump version 0.4.1 (OpenNMT#983)

* Fix preprocess filenames + cleaning. Bump version 0.4.1

Update CHANGELOG.md