improve readme

README.md

@@ -94,15 +94,17 @@ Flickr.authenticate(flickrOptions, function(error, flickr) {
 });
 ```
 
-### As flickrapi internally uses the request module, you can also pass default options for request
+### As flickrapi internally uses the request module, you can also pass default options for request that are accepted by request.defaults() as documented in the [request module](https://github.com/request/request#convenience-methods)
+
 
 ```
 var Flickr = require("flickrapi"),
     flickrOptions = {
       api_key: "API key that you get from Flickr",
       secret: "API key secret that you get from Flickr",
       requestOptions: {
-        timeout: 20000
+        timeout: 20000,
+        /* other default options accepted by request.defaults */
       }
     };
 

src/FlickrAPI.js

@@ -8,6 +8,7 @@
   options argument: {
     api_key: "your api key from flickr",
     secret: "your api key secret from flickr",
+    requestOptions: "object containing any value accepted by request.defaults()" optional
     user_id: negotiated through first-time authenticate() call
     access_token: negotiated through first-time authenticate() call
     access_token_secret: negotiated through first-time authenticate() call