ppc0018: Change status to Implemented

Implemented as the "module_true" feature:

https://perldoc.perl.org/blead/feature#The-'module_true'-feature

Author: rwp0

ppcs/ppc0018-module-true.md

@@ -5,7 +5,7 @@
     Author:  Curtis "Ovid" Poe <curtis.poe@gmail.com>
     Sponsor:
     ID:      0018
-    Status:  Draft
+    Status:  Implemented
 
 ## Abstract