Exclude .md-files from the trailing whitespaces check...

... since two trailing whitespaces carry a semanitic (namely a newline) in
Markdown.

Author: teiesti

ci/10-trailing_whitespaces.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 FOLDER="."
-FILES='.+\.\(md\|rs\|\sh\|toml\|txt\|yml\)'
+FILES='.+\.\(rs\|\sh\|toml\|txt\|yml\)'
 
 # Exit script on first error
 set -o errexit -o nounset