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+Upgrade from 0.5 to 0.6
+=======================
+
+Option
+------
+
+ * Option upchanges have been removed. Any price variations should be set using variations. The `value` property and 
+   corresponding methods have been changed to `index`
+
+   Before:
+
+   ```
+   public function setValue($value);
+   public function getValue();
+   ```
+   
+   After:
+   
+   ```
+   public function setIndex($index);
+   public function getIndex();
+   ```