Fix baseline URL

Author: astrofrog

tests/test_pytest_mpl.py

@@ -41,7 +41,7 @@ def test_succeeds_remote():
 
 # The following tries an invalid URL first (or at least a URL where the baseline
 # image won't exist), but should succeed with the second mirror.
-@pytest.mark.mpl_image_compare(baseline_dir='http://www.python.org,' + baseline_dir_remote,
+@pytest.mark.mpl_image_compare(baseline_dir='http://www.python.org/,' + baseline_dir_remote,
                                filename='test_succeeds_remote.png')
 def test_succeeds_faulty_mirror():
     fig = plt.figure()