Make the test test the *API*, not NVDA:)

Actually, the purpose of this commit is to bump the CI to run again,
because it failed with an error that seems intermittent, and very rare.

tests/test_api.py

@@ -20,7 +20,7 @@ def test_get_data():
         test_client = app.test_client()
         res = test_client.get('/api/ticker/nvda')
         data = res.text
-        assert json.loads(data)['debt_payoff_time'] == 0
+        assert json.loads(data)['debt_payoff_time'] >= 0
         assert res.status_code == 200
 
 def test_get_ten_cap_price():