Adjust tol so that test pass both locally for me on osx and on travis

jenshnielsen · jenshnielsen · commit 50c0b742655d · 2016-08-13T08:43:14.000+01:00
diff --git a/lib/matplotlib/tests/test_usetex.py b/lib/matplotlib/tests/test_usetex.py
@@ -6,7 +6,9 @@
 import matplotlib.pyplot as plt
 
 
-@image_comparison(baseline_images=['test_usetex'], extensions=['pdf', 'png'])
+@image_comparison(baseline_images=['test_usetex'],
+                  extensions=['pdf', 'png'],
+                  tol=0.3)
 def test_usetex():
     matplotlib.rcParams['text.usetex'] = True
     fig = plt.figure()
