v2.1.0

This release brings the CLIs features on-par with sharp.

• Added AVIF support.
• Added GIF support.
• Added clahe command.
• Added pipelineColourspace command.
• Added --alpha flag to ensureAlpha and negate.
• Added --center.
• Added --id.
• Added --lightness.
• Added --mozjpeg.
• Added --resolutionUnit.
• Added --timeout.
• Added --withoutReduction.
• Added --x1, --y2, --y3.
• Drop Node.js 10 support, now requires Node.js >= 12.22.
• Renamed --reductionEffort option to --effort.
• Replaced --squash by --bitdepth.
• Updated default --compressionLevel.
• Updated dependencies.