Update julia1.py

Fixed the doc string.  This version of the file _includes_ the optional image drawing.  But, the code only works if you use the Pillow fork of PIL.  The latest official PIL release (1.7.6) does not have the `Image.frombytes` method invoked here!

01_profiling/cpu_profiling/julia1.py

@@ -1,4 +1,4 @@
-"""Julia set generator without optional PIL-based image drawing"""
+"""Julia set generator with optional Pillow-based image drawing"""
 import time
 from PIL import Image
 import array