internal/cmd/weave: fix missing newline

Change-Id: Icd6026b2eafae254c0637a806e771334b4232fbd
Reviewed-on: https://go-review.googlesource.com/c/example/+/702378
Auto-Submit: Robert Findley <rfindley@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Alan Donovan <adonovan@google.com>

internal/cmd/weave/weave.go

diff --git a/internal/cmd/weave/weave.go b/internal/cmd/weave/weave.go
index d20e03c..bca5c82 100644
--- a/internal/cmd/weave/weave.go
+++ b/internal/cmd/weave/weave.go
@@ -84,7 +84,7 @@
 		}
 	}
 
-	printf("<!-- Autogenerated by weave; DO NOT EDIT -->")
+	printf("<!-- Autogenerated by weave; DO NOT EDIT -->\n")
 
 	// Pass 1: extract table of contents.
 	var toc []string