* Run scripts/generate_ast_stub.php against PHP master.
* Update version in php_ast.h to remove dev suffix.
* Update version, release date in package.xml.
* Check whether "The current version" in README.md is up to date.
* Run `pecl package package.xml`.
* Run `pecl install ast-XXX.tgz`.
* Commit.
* Create a tag.
* Bump version in php_ast.h and add dev suffix.
* Copy release in package.xml into changelog.
* Clear current changelog, bump versions and add dev suffix.
* Commit.
* Upload package on pecl.php.net.
