chore: updating calendar listing. (#120)

The AIP public calendar listing has changed. To prevent stale
invites, just noting that there is a community meeting instead
of a template link.

Author: toumorokoshi

README.md

@@ -51,7 +51,8 @@ following channels of communication are available:
 - [The #aip channel in the CNCF Slack](https://cloud-native.slack.com/archives/C04TX46UCTV).
   Sign up at https://slack.cncf.io.
 - [The AIP Google Calendar, to view any upcoming meetings](https://calendar.google.com/calendar/u/0?cid=N2UzNWRkM2RmMTk0YTMyZjRmYTdjMDNhMzQ1NGUyNGJhMzY1MWU2ZjU2ODI0OGVmZTFkZGYxZTM0YTdiZWU5ZUBncm91cC5jYWxlbmRhci5nb29nbGUuY29t).
-  - [The AIP Community Meeting, for general topics, those who want to introduce themselves, or want to learn more about the AIPs](https://calendar.google.com/calendar/event?action=TEMPLATE&tmeid=NXRiMmMxcTRoY2hnbG51ZGpnN2kyZHBqbjlfMjAyMzA0MTlUMTYwMDAwWiA3ZTM1ZGQzZGYxOTRhMzJmNGZhN2MwM2EzNDU0ZTI0YmEzNjUxZTZmNTY4MjQ4ZWZlMWRkZjFlMzRhN2JlZTllQGc&tmsrc=7e35dd3df194a32f4fa7c03a3454e24ba3651e6f568248efe1ddf1e34a7bee9e%40group.calendar.google.com&scp=ALL).
+  - A community meeting is also listed, subject to change but currently
+    Wednesday mornings PST.
 
 ## License