Update backtesting/_plotting.py

Author: kernc

backtesting/_plotting.py

@@ -88,8 +88,7 @@ def colorgen():
 def lightness(color, lightness=.94):
     rgb = np.array([color.r, color.g, color.b]) / 255
     h, _, s = rgb_to_hls(*rgb)
-    rgb = np.array(hls_to_rgb(h, lightness, s)) * 255
-    rgb = np.rint(rgb)
+    rgb = (np.array(hls_to_rgb(h, lightness, s)) * 255).astype(int)
     return RGB(*rgb)