Improvements

• Cargo.lock-specified dependencies now compatible with rustc 1.38.0 and further
• At default settings, compared to v0.3.1, quality is improved by less than 1%
• The encoding time is decreased by less than 5%
• 4:2:2 and 4:4:4 clips should encode correctly with this release
• Some tiling/resolution configurations no longer cause issues.
• Available in crates.io again.