[release-branch.go1.12] go1.12.13

Change-Id: Ic4db4625c4b7031aa08cb235f526267058a50430
Reviewed-on: https://go-review.googlesource.com/c/go/+/204641
Run-TryBot: Andrew Bonventre <andybons@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alexander Rakoczy <alex@golang.org>

VERSION

diff --git a/VERSION b/VERSION
index 8673d6c..ad498dc 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-go1.12.12
\ No newline at end of file
+go1.12.13
\ No newline at end of file