Merge pull request AtsushiSakai#170 from kk2491/patch-1

Update rrt_with_pathsmoothing.py

Author: AtsushiSakai

PathPlanning/RRT/rrt_with_pathsmoothing.py

@@ -9,6 +9,7 @@
 import random
 import math
 import copy
+import numpy as np
 
 show_animation = True