transform/livereloadinject: Add defer to livereload script tag

In #6821 we moved the loading from end of body to head to make Turbolinks and similar work.

This commit adds a defer attribute to avoid page parse blocking.

transform/livereloadinject/livereloadinject.go

@@ -59,7 +59,7 @@ func New(port int) transform.Transformer {
 			return err
 		}
 
-		script := []byte(fmt.Sprintf(`<script src="/livereload.js?port=%d&mindelay=10&v=2" data-no-instant></script>`, port))
+		script := []byte(fmt.Sprintf(`<script src="/livereload.js?port=%d&mindelay=10&v=2" data-no-instant defer></script>`, port))
 
 		i := idx
 		if match.appendScript {