README: advantages over perl -pe?

[huyz]

This may be out of scope, but would it be helpful to add a bit to the README about how sd could be better than running perl -pe, perl -ne, and perl -pi -e?

[ZJaume]

Compared to that command, you'll get unicode support by default. That command needs more options to enable unicode support. And even when activating unicode support with all that amount of confusing options perl has, I found some cases where perl still fucked up and produced mojibake at the output.

[dungsaga]

on the other hand, sd can't handle binary file well. See #312