Update state getter and setter

Author: hamermike

src/main/java/com/bandwidth/iris/sdk/model/AvailableNpaNxx.java

@@ -75,11 +75,11 @@ public void setQuantity(int quantity) {
         this.quantity = quantity;
     }
 
-    public int getState() {
+    public String getState() {
         return state;
     }
 
-    public void setState(int state) {
+    public void setState(String state) {
         this.state = state;
     }
 }