Update mustache dependency and remove patch

Change timing of when to polyfill `is_customize_preview()` (wp-cli#5314)

Change timing of when to polyfill `is_customize_preview()`

Adapt README.md

Merge pull request wp-cli#5208 from wp-cli/bump-version-to-220

Bump version to 2.2.0

Adapt requirements

Merge pull request wp-cli#4923 from wp-cli/4921-handle-asset-less-rel…

…eases

Skip releases that lack a downloadable asset

Merge pull request wp-cli#4897 from wp-cli/bump-version-to-2-0-0

Bump version to 2.0.0

Adapt VERSION file to reflect 1.5.1 version

Merge pull request wp-cli#4656 from wp-cli/update-to-1-5-0

Update to 1.5.0

Bump version to 1.4.1