Moved HTML5 helpers to subpackage

example/example.go

@@ -1,7 +1,8 @@
 package main
 
 import (
-	h "gitlab.codemonkeysoftware.net/b/hatmill"
+	"gitlab.codemonkeysoftware.net/b/hatmill"
+	h "gitlab.codemonkeysoftware.net/b/hatmill/html5"
 	"os"
 )
 
@@ -16,5 +17,5 @@ func main() {
 			),
 		),
 	)
-	h.WriteDocument(os.Stdout, document)
+	hatmill.WriteDocument(os.Stdout, document)
 }