Fixed config file.

Author: MaxBlesch

ruspy/ruspy_config.py

@@ -5,7 +5,6 @@
 import numpy as np
 
 # We only support modern Python.
-np.testing.assert_equal(sys.version_info[0], 3)
 np.testing.assert_equal(sys.version_info[:2] >= (3, 6), True)
 
 # We rely on relative paths throughout the package.