devapp: update burndown chart to track 1.16 milestone

Change-Id: Ibac27c0253468f3b0c66ad0e1c9d3954b35b5c7a
Reviewed-on: https://go-review.googlesource.com/c/build/+/248157
Reviewed-by: Andrew Bonventre <andybons@golang.org>
Run-TryBot: Andrew Bonventre <andybons@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
diff --git a/devapp/release.go b/devapp/release.go
index 8a37a9f..28defc7 100644
--- a/devapp/release.go
+++ b/devapp/release.go
@@ -27,11 +27,11 @@
 	prefixDev      = "[dev."
 
 	// The title of the current release milestone in GitHub.
-	curMilestoneTitle = "Go1.15"
+	curMilestoneTitle = "Go1.16"
 )
 
 // The start date of the current release milestone.
-var curMilestoneStart = time.Date(2020, 2, 21, 0, 0, 0, 0, time.UTC)
+var curMilestoneStart = time.Date(2020, 8, 12, 0, 0, 0, 0, time.UTC)
 
 // titleDirs returns a slice of prefix directories contained in a title. For
 // devapp,maintner: my cool new change, it will return ["devapp", "maintner"].