Updated README.md with new endpoint

Author: Jackymancs4

README.md

@@ -36,9 +36,11 @@ Assuming your server lives at `myserver.com`, and you've configured the middlewa
 * `myserver.com/myAvatars/:size/:id`
     * returns an avatar for the provided `id` at the specified `size`
     * size cannot exceed 400px
-* `myserver.com/myAvatars/face/:eyes/:nose/:mouth/:color`
+* `myserver.com/myAvatars/face/:eyes/:nose/:mouth/:color/:size?`
     * Allows you to generate a custom avatar from the specified parts and color
     * e.g. `myserver.com/myAvatars/face/eyes1/nose2/mouth4/DEADBF`
+    * You can also set the size of your custom avatar
+    * e.g. `myserver.com/myAvatars/face/eyes1/nose2/mouth4/DEADBF/300`
 * `myserver.com/myAvatars/list`
     * returns JSON of all valid parts for the custom endpoint above