`iotools.psm3` test is broken

[cwhanse]

Describe the bug
The TMY data downloaded by test_psm3.test_get_psm3 has timestamps at 30 minutes past the hour, rather than on the hour, which is different from the data in test_psm3.csv.

To Reproduce

LATITUDE, LONGITUDE = 40.5137, -108.5449
PVLIB_EMAIL = 'pvlib-admin@googlegroups.com'
DEMO_KEY = 'DEMO_KEY'
result = get_psm3(latitude=LATITUDE, longitude=LONGITUDE, api_key=DEMO_KEY, email=PVLIB_EMAIL)
data = result[1]

Compare data.Minute with Minute column in test_psm3.csv.

Expected behavior
It appears to be a change in the NSRDB.

Versions:

• pvlib.0.6.3: