README.md: fixes usage example (now is preferred in tcl-core to -now and only documented at the moment)

sebres · web-flow · commit 5cc3a1ed4c77 · 2025-08-04T22:23:26.000+02:00
diff --git a/README.md b/README.md
@@ -36,7 +36,7 @@ How to use ?
 
 ```tcl
 package require tclclockmod
-clock format -now
+clock format now
 ```
 
 Performance ?
