fix sample program

reingart · web-flow · commit 0b1f2d3d0dea · 2024-04-21T15:04:39.000-05:00
diff --git a/practice/hello-world/hello_world.py b/practice/hello-world/hello_world.py
@@ -1,2 +1,2 @@
 def hello():
-    return 'Hello world!'
+    return 'Hello, World!'
