main.go: gofmt format

Change-Id: I9098344d41057adbe415dda786b833562c1e2af8
Reviewed-on: https://go-review.googlesource.com/c/vgo/+/520736
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
TryBot-Bypass: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
diff --git a/main.go b/main.go
index c956185..ea01f34 100644
--- a/main.go
+++ b/main.go
@@ -22,7 +22,6 @@
 // and put the prefix `x/vgo:` in the issue title.
 //
 // Thank you.
-//
 package main
 
 import Main "cmd/go"