Update dependencies and fix lints (#912)

Updates all dependencies to the latest versions,
except for nom, which requires some more code changes.

Closes #911

Version bump to 0.4.4

Update compiling.md

Rephrase VapourSynth setup to prevent people into thinking that a certain version of VapourSynth is required
Avoid directly linking NASM for the same reason

Update README.md

Av1an 0.4.0

Update version to 0.3.1 (#541)

Fix av1an versions in root cargo toml (#515)

av1an 0.2.0 release

Merge branch 'master' of https://github.com/master-of-zen/Av1an