2016/state-of-go/runtime: fix build tag comment breaking the build at tip

go vet failed on this in Go 1.10.

Change-Id: Ib9fc409bb0c9a6b7dd22723ee5e64470cb8f4aea
Reviewed-on: https://go-review.googlesource.com/80296
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/2016/state-of-go/runtime/crash.go b/2016/state-of-go/runtime/crash.go
index 60a07bb..7a28524 100644
--- a/2016/state-of-go/runtime/crash.go
+++ b/2016/state-of-go/runtime/crash.go
@@ -1,4 +1,4 @@
-/// +build OMIT
+// +build OMIT
 
 package main