Merge pull request #220 from anthonyduong9/solve-exercise-24

solves exercise 24

Author: rougier

source/exercises100.ktx

@@ -260,7 +260,7 @@ Multiply a 5x3 matrix by a 3x2 matrix (real matrix product) (★☆☆)
 hint:
 
 < a24
-Z = np.dot(np.ones((5,3)), np.ones((3,2)))
+Z = np.matmul(np.ones((5, 3)), np.ones((3, 2)))
 print(Z)
 
 # Alternative solution, in Python 3.5 and above