talks/present: update "moved" message to golang.org/x name

LGTM=adg
R=adg
CC=golang-codereviews
https://golang.org/cl/175750043
diff --git a/present/moved.go b/present/moved.go
index 217fa15..a9b2cdd 100644
--- a/present/moved.go
+++ b/present/moved.go
@@ -7,11 +7,11 @@
 
 const moved = `
 
-The present tool has moved to the go.tools repository.
+The present tool has moved to the Go tools repository.
 
 Please install it from its new location:
 
-	go get code.google.com/p/go.tools/cmd/present
+	go get golang.org/x/tools/cmd/present
 
 
 `