function onReadmes( error, files ) {
		if ( error ) {
			debug( 'Encountered an error when searching for READMEs. Error: %s', error.message );
			return done( error );
		}
		debug( 'Found %d READMEs.', files.length );
		if ( files.length === 0 ) {
			return done( null, null );
		}
		debug( 'Files: %s', JSON.stringify( files ) );
		debug( 'Reading file contents...' );
		readFileList( files, FOPTS, onFiles );
	}
Callback invoked after finding package READMEs.

@private
@param {(Error|null)} error - error object
@param {StringArray} files - list of file paths
@returns {void}