Add PSR-3 upgrade to-do to README.

Author: timdev

README.md

@@ -123,7 +123,12 @@ class SomeService
 - [ ] Make MonologStackLogger implement Monolog's ResettableInterface? 
 - [ ] Consider how this might play with Laravel, the insanely popular PHP 
       framework that I do my best to avoid. 😜
+- [ ] Track what's going on with PSR-3 v2/v3 as well as monolog and 
+      laminas-log. Eventually, we should rely on the updated + better-typed  
+      versions of the spec. We may need to drop the laminas-log test code since
+      laminas-log will likely always require psr/[email protected]
 
+      
 
 [similar functionality]: https://getpino.io/#/docs/child-loggers
 [pinojs]: https://github.com/pinojs/pino