renew_cert.sh: fix unusual shebang

[jwilk]

No description provided.

[StephenBrown2]

I'd say that's legit either way.

However to truly "fix" it, one might use the env binary, like so:

#!/usr/bin/env sh

[jwilk]

Huh? I've never seen a shell script with a /usr/bin/sh or /usr/bin/env sh shebang before.
I've just checked all unixish systems I had access to (Debian 8.3, PLD Linux 3.0, FreeBSD 10.2, OpenBSD 5.7): all of them had /bin/sh; none of them had /usr/bin/sh.
Can you name one system released in the last decade that has /usr/bin/sh but no /bin/sh, or one that has /usr/bin/env but no /bin/sh?

[StephenBrown2]

Nope, just saying that's my convention for universality, since I'm used to python or perl or bash or zsh.

It's a good fix.

[diafygi]

Keeping it the way it is for now.