added helpful error throw

Author: JoshuaWise

lib/database.js

@@ -25,6 +25,9 @@ function Database(filenameGiven, options) {
 	if (typeof options !== 'object' || options === null) {
 		options = {};
 	}
+	if ('readOnly' in options) {
+		throw new TypeError('Misspelled option "readOnly" should be "readonly"');
+	}
 	var memory = util.getBooleanOption(options, 'memory');
 	var readonly = util.getBooleanOption(options, 'readonly');
 	var fileMustExist = util.getBooleanOption(options, 'fileMustExist');