[dev.boringcrypto.go1.8] misc/boring: update VERSION

Change-Id: I805422f3bc4a8a64e55b7453da25c9d1e18f063f
Reviewed-on: https://go-review.googlesource.com/65394


Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
Reviewed-on: https://go-review.googlesource.com/65511