Bump to v0.9.0

Bump to v0.8.3

Bump to v0.8.0 and thank @erikerlandson

Update to v0.7.2

Fix jsvine#90 and bump to v0.7.1

... where .make_sentence incorrectly assumed that
(state_size - len(init_state)) <= 1

Thanks to @quietmint for flagging!

Bump to v0.7.0

Bump to v0.6.3

Merge pull request jsvine#78 from thallada/combine-retain-original-false

Combine models with retain_original=False, and docs

Bump to v0.6.2

Add Chains Invent Insanity