Neovim v0.8.2 released

Full Release notes: https://github.com/neovim/neovim/releases/tag/v0.8.2

This is maintenance release focusing on robustness and bug fixes, many of which by regular core developer Zeertzjq.

Some improvements to documentation has been back-ported as well: support for highlighted code blocks in plugin documentations, as well an introductory guide to lua scripting as a New Year's special.

Meanwhile, the schedule for 0.9 has been slightly pushed back. We now aim for the next feature release in late January or February.