travis: 3.7 support

Author: dylanaraps

tests/test_colors.py

@@ -12,11 +12,6 @@ def test_gen_colors(self):
         result = colors.get("tests/test_files/test.jpg")
         self.assertEqual(len(result["colors"]["color0"]), 7)
 
-    def test_gen_colors_fail(self):
-        """> Generate a colorscheme and fail."""
-        with self.assertRaises(SystemExit):
-            colors.get("tests/test_files/test.png")
-
     def test_color_import(self):
         """> Read colors from a file."""
         result = colors.file("tests/test_files/test_file.json")