reafactor examples to use lists as inputs

Author: HugoMVale

README.md

@@ -39,11 +39,11 @@ The following example demonstrates a simple use of the package. For more compreh
 from odrpack import odr_fit
 import numpy as np
 
-xdata = np.array([0.982, 1.998, 4.978, 6.01])
-ydata = np.array([2.7, 7.4, 148.0, 403.0])
+xdata = [0.982, 1.998, 4.978, 6.01]
+ydata = [2.7, 7.4, 148.0, 403.0]
 
-beta0 = np.array([2.0, 0.5])
-bounds = (np.array([0.0, 0.0]), np.array([10.0, 0.9]))
+beta0 = [2.0, 0.5]
+bounds = ([0.0, 0.0], [10.0, 0.9])
 
 def f(x: np.ndarray, beta: np.ndarray) -> np.ndarray:
     "Model function."