Bump version numbers.

Bump version numbers.

Increment version number.

Update AUTHORS.

Update version numbers.

Update AUTHORS.

Return a clean root node on resignation.

We rely on m_root not being null, so if there is no good tree to take
a move from, make a clean new root.

Fixes issue leela-zero#680.

Bump version number.

Bump expected Leela version in AutoGTP.

Bump version number.

The noise fixes warrant a new release.