Make sure the "1.2.0-alpha" version is indeed accepted.

Author: schlessera

scaffold-package-command.php

@@ -16,7 +16,7 @@
 };
 
 // Only use command hooks in versions that support them.
-if ( version_compare( WP_CLI_VERSION, '1.2.0-alpha', '>' ) ) {
+if ( version_compare( WP_CLI_VERSION, '1.2.0-alpha', '>=' ) ) {
 	WP_CLI::add_hook( 'after_add_command:scaffold', $registration );
 } else {
 	$registration();