fix: align shebang

README.md

@@ -30,7 +30,7 @@ chmod +x m2h.pl
 Convert a markdown file to HTML:
 
 ```bash
-perl -Ilibm2h.pl input.md > output.html
+perl -Ilib m2h.pl input.md > output.html
 ```
 
 Or read from stdin:

m2h.pl

@@ -1,4 +1,4 @@
-#!perl -w
+#!/usr/bin/env perl -w
 use strict;
 use Getopt::Long;
 use MarkdownParser;