chg: [doc] in case btc expansion fails, give another hint at why it fails

tests/test_expansions.py

@@ -105,9 +105,10 @@ class TestExpansions(unittest.TestCase):
         query = {"module": "btc_steroids", "btc": "1ES14c7qLb5CYhLMUekctxLgc1FV2Ti9DA"}
         response = self.misp_modules_post(query)
         try:
-            self.assertTrue(self.get_values(response).startswith('\n\nAddress:\t1ES14c7qLb5CYhLMUekctxLgc1FV2Ti9DA\nBalance:\t0.0000000000 BTC (+0.0005355700 BTC / -0.0005355700 BTC)'))
+            self.assertTrue(self.get_values(response).startswith('\n\nAddress:\t1ES14c7qLb5CYhLMUekctxLgc1FV2Ti9DA\nBalance:\t0.0002126800 BTC (+0.0007482500 BTC / -0.0005355700 BTC)'))
+
         except Exception:
-            self.assertEqual(self.get_values(response), 'Not a valid BTC address')
+            self.assertEqual(self.get_values(response), 'Not a valid BTC address, or Balance has changed')
 
     def test_btc_scam_check(self):
         query = {"module": "btc_scam_check", "btc": "1ES14c7qLb5CYhLMUekctxLgc1FV2Ti9DA"}