docs: removed response from initSession to remove confusion

Author: ethanneff

README.md

@@ -261,11 +261,7 @@
         // read deep link data on click
         alert('Deep Link Data: ' + JSON.stringify(data))
       }
-    }).then(function(res) {
-      alert('Response: ' + JSON.stringify(res))
-    }).catch(function(err) {
-      alert('Error: ' + JSON.stringify(err))
-    })
+    });
     ```
 
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