Merge pull request wp-cli#94 from wp-cli/regenerate-readme

Regenerate README file

Merge pull request wp-cli#90 from wp-cli/update-wp-cli-tests-v4

Add `wp cache flush-group` for flushing a cache group (wp-cli#85)

* Added group flushing.

Needs extra input for testing.

* Added failsafe for older WP versions.

Also phpcs formatting.

* Processed feedback.

* Added test for error on clear-group

* Renamed clear-group to flush-group

Fixed failing test and generated readme file.

* Set correct error message in the test.

* Make sure a test only runs at 6.1 or later.

Warn when `wp transient list` is used with external object cache (wp-…

…cli#82)

Merge pull request wp-cli#74 from wp-cli/fix/make-transient-delete-te…

…st-more-robust

Merge pull request wp-cli#73 from wp-cli/fix/adapt-branch-alias

Merge pull request wp-cli#72 from wojsmol/fix/php8.1-compat

Merge pull request wp-cli#71 from wp-cli/regenerate-readme

Regenerate README file

Merge pull request wp-cli#70 from wojsmol/tests-to-dev

Move  wp-cli/wp-cli-tests to dev dependecies and update

Merge pull request wp-cli#66 from wp-cli/add/switch-to-github-actions