v0.20.6 - 20th August 2018

• Add removeAlpha operation to remove alpha channel, if any. #1248

• Expose mozjpeg quant_table flag. #1285 @rexxars

• Allow full WebP alphaQuality range of 0-100. #1290 @sylvaindumont

• Cache libvips binaries to reduce re-install time. #1301

• Ensure vendor platform mismatch throws error at install time. #1303

• Improve install time error messages for FreeBSD users. #1310

• Ensure extractChannel works with 16-bit images. #1330

• Expose depth option for tile-based output. #1342 @alundavies

• Add experimental entropy field to stats response.