ngx-releng: check both README.markdown and README.md.

Author: agentzh

ngx-releng

@@ -7,7 +7,11 @@ if [ -n "$wiki_file" -a  -f "$wiki_file" ]; then
     #pod2text /tmp/a.pod > README || exit 1
 fi
 
-ack '(?<=This document describes )(?:.*-nginx-module|ngx_\w+) .*?v(\d+\.\d[^\s\]]*)' README.markdown
+if [ -f README.markdown ]; then
+    ack '(?<=This document describes )(?:.*-nginx-module|ngx_\w+) .*?v(\d+\.\d[^\s\]]*)' README.markdown
+elif [ -f README.md ]; then
+    ack '(?<=This document describes )(?:.*-nginx-module|ngx_\w+) .*?v(\d+\.\d[^\s\]]*)' README.md
+fi
 
 echo =======================================