small edit in readme

README.md

@@ -7,7 +7,7 @@ import cookies from "node-fetch-cookies";
 // "rw" are the flags, meaning cookies will be read and written from/to the cookie jar. r = read, w = write
 // second argument is the filename, can also be undefined if you don't want to read/write the cookies from/to a file
 let cookieJar = new cookies.CookieJar("rw", "path/to/file.json");
-// first parameter is the url, second the options, just like node-fetch. third parameter is the cookie jar
+// first parameter is the url, second the options, just like node-fetch. third parameter is the cookie jar (can also be an array)
 // returns a response object just like node-fetch
 cookies.fetch("https://example.page/example/path", null, cookieJar);
 ```