Remove xfail in  gammapy/time/tests/test_lightcurve.py
@@ -86,10 +86,6 @@ def test_lightcurve_properties_flux(lc):
# is no header info in CSV to store the time scale!
-@pytest.mark.skipif(
- sys.version_info >= (3, 7),
- reason="https://github.com/astropy/astropy/issues/7744#issuecomment-419813519",
-)
@pytest.mark.parametrize("format", ["fits", "ascii.ecsv", "ascii.csv"])
def test_lightcurve_read_write(tmpdir, lc, format):
filename = str(tmpdir / "spam")
