Alignment with Commit 2bbfaa5. Use /usr/bin/env bash shebangs instead of /bin/bash.

Author: zawaza-blog

impls/modula2/run

@@ -1,3 +1,3 @@
-#!/bin/bash
+#!/usr/bin/env bash
 cd $(dirname $0)
 exec ./${STEP:-stepA_mal} "${@}"