code: function( source, target, options, callback ) {
  	if ( typeof options === 'function' ) {
  		callback = options;
  		options = null;
  	}
  	options = options || {};
  	addExtraOptions( [ 'quiet', 'msg', 'verbose', 'log', 'showRevs' ], options );
  	executeSvn( [ 'mergeinfo' ].concat( source ).concat( target ), options, callback );
  }
docs: Query information related to merges (or potential merges) between SOURCE and TARGET.
  @function mergeinfo
  @memberof commands
  @param {string} source - SOURCE URL
  @param {string} target - TARGET URL
  @param {object} [options] - Options object
  @param {function} [callback] - Complete callback