fix : update function name.

Author: manas-shinde

examples/demo_time.py

@@ -2,10 +2,10 @@
 
 
 @time_execution
-def loop():
+def long_for_loop():
     for i in range(100000000):
         pass
 
 
 if __name__ == "__main__":
-    loop()
+    long_for_loop()