Update README.md

Updated layercontents.plist to remove background layers

Double checked that font builds this time 😒

Bump lxml from 4.5.2 to 4.6.2 (microsoft#396)

Bumps [lxml](https://github.com/lxml/lxml) from 4.5.2 to 4.6.2.
- [Release notes](https://github.com/lxml/lxml/releases)
- [Changelog](https://github.com/lxml/lxml/blob/master/CHANGES.txt)
- [Commits](lxml/lxml@lxml-4.5.2...lxml-4.6.2)

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Azure Pipelines: add PR trigger, streamline to one phase (microsoft#367)

Multiprocessing v2 (microsoft#363)

Integrated in Python multiprocessing pools to enable the fonts to build
significantly faster. Also integrates skia-pathops for faster static
font generation, and rejigs the build process to get rid of the really
slow copy commands. Thanks @madig!!!

See discussion in microsoft#361 for more details about what's happened and
why. :)

Much snappier!

Co-authored-by: Nikolaus Waxweiler <[email protected]>