Improved README

Author: caderek

README.md

@@ -166,7 +166,7 @@ aoctimer summary
 You can save the output of the commands to the file, using standard command-line piping:
 
 ```sh
-# Save summary (Bash / zsh / fish):
+# Save summary (Bash / zsh / fish / PowerShell):
 aoctimer summary > MY_FILE.txt
 ```