Now works with dash!

[KonaArctic]

Deleted bashism so it now works with dash.

I use Debian too so this fixes issue 7.

Tested to work with various combinations of bash, dash, wget, and curl.

[diniciacci]

There is another line that you might want to change IMHO: https://github.com/proprietary/chromium-widevine/blob/fcaae76eeca9d5d900bd1a5b9ed2911555a6bf61/use-standalone-widevine.sh#L10

should not enforce /bin/sh, else I fear the shebang in the file executed is ignored, and the shebang selected shell is ignore (choosing another shell is a legit thing to do even if you fixed the script to a particular shell). This was what was happening locally, but I'm not an script expert.