message: updated doc for sphinx compilation
diff: @@ -25,6 +25,7 @@ Note that persistence diagrams must be submitted as (n x 2) numpy arrays and mus
  .. testcode::
  import gudhi
  + import numpy as np
  diag1 = np.array([[2.7, 3.7],[9.6, 14.],[34.2, 34.974]])
  diag2 = np.array([[2.8, 4.45],[9.5, 14.1]])
  