Update file(s) from "wp-cli/.github"

Update package requirements

Update file(s) from wp-cli/.github

Add .gitattributes file

See wp-cli/wp-cli#5070

Merge pull request #169 from wp-cli/fix/tests

Fix tests for Hello Dolly

Merge pull request #167 from wp-cli/fix-tests

Fix failing tests

Merge pull request #164 from wp-cli/refine-feature-files

Fix docstring indent issue in feature files

Merge pull request #160 from wp-cli/no-lock-file

Merge pull request #153 from UmeshSingla/90-update-language-install-doc

Update examples for language command (#145)

* Update examples for language command

* Update README

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Co-authored-by: Daniel Bachhuber <daniel.bachhuber@automattic.com>