[x/tour] content: add newline to imports.go Printf call

Fixes golang/tour#615

Change-Id: I59401792b7aeddbdbf4baadeb822827bd19835cf
Reviewed-on: https://go-review.googlesource.com/138615
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
X-Tour-Commit: 099a0d9cc2550885869179752dfff56fc681295c
diff --git a/tour/content/basics/imports.go b/tour/content/basics/imports.go
index 9854405..8424aca 100644
--- a/tour/content/basics/imports.go
+++ b/tour/content/basics/imports.go
@@ -8,5 +8,5 @@
 )
 
 func main() {
-	fmt.Printf("Now you have %g problems.", math.Sqrt(7))
+	fmt.Printf("Now you have %g problems.\n", math.Sqrt(7))
 }