Satisfy yamllint checking of .yamllint

The 1.18.0 release of yamllint has started linting its .yamllint
config file by default. Add a document marker at the top of the file
so that it will pass document-start rule.

diff --git a/.yamllint b/.yamllint
index a477f75..e12a1f1 100644 (file)
--- a/.yamllint
+++ b/.yamllint
@@ -1,3 +1,4 @@
+---
 # Copyright (c) 2018 mudpy authors. Permission to use, copy,
 # modify, and distribute this software is granted under terms
 # provided in the LICENSE file distributed with this software.