Drop "-t" in markdownfmt.sh so we can redirect output

markdownfmt.sh

@@ -1,4 +1,4 @@
 #!/bin/bash
 set -e
 
-exec docker run -it --rm -v "$PWD":/scratch -w /scratch tianon/markdownfmt markdownfmt "$@"
+exec docker run -i --rm -v "$PWD":/scratch -w /scratch tianon/markdownfmt markdownfmt "$@"