Fix usage

Author: Max Leiter

README.md

@@ -4,11 +4,11 @@ A lightweight vanilla Javascript micro-library for making collapsible trees with
 ## usage
 
   ```
-  jsonTree.init(object, selector, depth);
+  new jsonTree(object, selector, depth);
   ```
 
 Because jsonTree uses document.querySelector(selector), selector can either be an ID or class, just be sure to specify with the proper identifier (. for class and # for ID).
 
 "depth" is a boolean which decides if jsonTree should apply a class to all children elements ("depth-#"). This can be used for custom styling but may increase loading times.
 
-The JSON object must be a valid JavaScript object or a properly formatted URL(http://, etc), as XMLHttpRequests are annoying that way.
+The JSON object must be a valid JavaScript object or a properly formatted URL (http://, etc), as XMLHttpRequests are annoying that way.