Merge pull request mlua-rs#279 from amethyst/fix-readme

Fix table in README.md

Merge pull request mlua-rs#278 from amethyst/update_0.19.6

Updates for 0.19.6.

Update sys crate versions.

Merge pull request mlua-rs#270 from amethyst/update_0.19.5

Update versions and changelog ready for 0.19.5 release.

Update versions and changelog ready for release.

Bump rlua version and the Lua 5.4 -sys dependency version.

Merge pull request mlua-rs#257 from amethyst/fix-no-oslib

Fix no oslib

Merge pull request mlua-rs#256 from amethyst/optional-oslib

Add `lua-no-oslib` feature to not compile in the `os` lib.

Fix Cargo.toml syntax issue.

Prepare for release 0.19.2.