Release 0.7.0 preparation (skorch-dev#567)

* Version bump

* Remove deprecated skorch.callbacks.CyclicLR

Use torch.optim.lr_scheduler.CyclicLR instead.

* Prepare CHANGES.md for new release

* Update links in CHANGES.md

* Bump min. torch version to 1.1.0

Bump to 0.6.0

Satisfy pypi version linter

Bump version

Bump version to 0.4.0

Release 0.3.0

Bump version to 0.2.0

Prepare 0.1.0