Bump version to 0.14.0

Bump version to 0.13.0

Bump version to 0.12.0

Bump version to 0.11.0

Bump version to 0.10.0

Bump version to 0.9.0

Note that the "..broader range of characters in header values" change
was not released in 0.8.1, hence the move in the changelog.

Bump version to 0.8.1

Bump version to 0.8.0

Bump version to 0.7.0

Sphinx confuses me

The docs say that .. highlight:: sets a default language until the next
.. highlight:: command, but look at the rendered text on RTD it seemed
to only affect immediately following source block, not the one after
that.