ansible: added todo to automate Jenkins worker IPs for github-bot

Instead of keeping the list of whitelisted Jenkins worker IPs up-to-date
manually, it would be ideal to automate that with a python script
instead.

Refs nodejs#985 (comment)

ansible/README.md

@@ -175,6 +175,8 @@ Unsorted stuff of things we need to do/think about
 - [ ] add explicit ARCH and DESTCPU for release machines (RV: I'm adding
       "arm64" manually for both to force the right thing, from memory I've
       needed to do this on x86 and x64, best be explicit to be sure)
+- [ ] github-bot: automate list of whitelisted Jenkins worker IPs with
+      python
 
 [callback]: plugins/inventory/nodejs_yaml.py