Update galaxy.py

Author: TimGoTheCreator

examples/GalaxyDemo/galaxy.py

@@ -4,7 +4,7 @@
 if root not in sys.path:
     sys.path.insert(0, root)
 
-from tools.icbuilder import disk, save
+from tools.icbuilder import diskNoDM, save
 
-particles = disk(20000, radius=0.5, mass=1.0, thickness=0.2)
-save("galaxy.txt", particles)
+particles = diskNoDM(20000, radius=0.5, mass=1.0, thickness=0.2)
+save("galaxy.txt", particles)