Merge pull request #157 from kazhuravlev/patch-1

Fix example

README.markdown

@@ -20,8 +20,10 @@ Run something in the VM
 
 Get a value out of the VM
 
-    value, err := vm.Get("abc")
-    	value, _ := value.ToInteger()
+    if value, err := vm.Get("abc"); err == nil {
+    	if value_int, err := value.ToInteger(); err == nil {
+    	    fmt.Printf("", value_int, err)
+    	}
     }
 
 Set a number