Add timezone example in test_calendar.yaml

- First event uses meta timezone, second one now uses the explicit
  timezone.

Author: rkdarst

example/test_calendar.yaml

@@ -1,12 +1,15 @@
+meta:
+  tz: America/Los_Angeles
+
 events:
   - summary: Event of the Century
-    begin: 2021-09-21 15:00:00 -07:00
-    end: 2021-09-21 15:30:00 -07:00
+    begin: 2021-09-21 15:00:00
+    end: 2021-09-21 15:30:00
     description: |
       Meet the team on the northern side of the field.
 
   - summary: Half-an-hour meeting
-    begin: 2021-09-23 15:00:00
+    begin: 2021-09-23 15:00:00 -07:00
     duration:
       minutes: 30
     location: |