Reserve a placeholder for Bazel and plugins

DavidO is planning to talk about Bazel and how to get
the best of it for developing Gerrit plugin.

Taking a placeholder for him so that the full talk
description can be tidy-up later.

Change-Id: I5040e9e3718e401a72b2f861f11c117444939339
diff --git a/schedule.md b/schedule.md
index a50bed7..d4e75db 100644
--- a/schedule.md
+++ b/schedule.md
@@ -16,7 +16,7 @@
 | 11:30 | [Different change workflows in Gerrit](sessions/different-change-workflows-in-gerrit.md)     |
 | 12:15 | Lunch & Networking                                                                           |
 | 14:00 | [Gerrit Multi-master & multi-site: an OpenSource solution](sessions/multi-master-multi-site.md)|
-| 14:20 | Session #5                                                                                   |
+| 14:20 | [Developing and building plugins with Bazel] - *PLACEHOLDER*                                 |
 | 14:45 | [Gerrit 2.16, 3.0 and beyond] - *PLACEHOLDER*                                                |
 | 15:30 | Break & Networking                                                                           |
 | 16:00 | [Q&A with the Gerrit Maintainers](sessions/maintainers-qa.md)                                |