Mark OpenAQ S3 bucket test skipped

if permission denied
(it should always be now, since was recently made private)

tests/test_openaq.py

@@ -11,7 +11,10 @@ def test_openaq():
     # First date in the archive, just one file
     # Browse the archive at https://openaq-fetches.s3.amazonaws.com/index.html
     dates = pd.date_range(start="2013-11-26", end="2013-11-27", freq="H")[:-1]
-    df = openaq.add_data(dates)
+    try:
+        df = openaq.add_data(dates)
+    except PermissionError:
+        pytest.skip("private")
     assert not df.empty
     assert df.siteid.nunique() == 1
     assert (df.country == "CN").all() and ((df.time_local - df.time) == pd.Timedelta(hours=8)).all()