update the pillow array API

jet_detection.py

@@ -203,7 +203,7 @@ JET_TREE = cKDTree(jet_pts)
 
 def points_near_jet(img, r=0.2, plot=False):
     # Represent image as float so we can perform division
-    img = np.array(img, dtype="float").reshape(-1, 3)
+    img = np.array(img).astype(float).reshape(-1, 3)
     img /= 255  # Map colors into a unit cube.
     img_tree = cKDTree(img, balanced_tree=False, compact_nodes=False)
     pts = [res for neighs in JET_TREE.query_ball_tree(img_tree, r) for res in neighs]