bors 74530adcba Auto merge of #6166 - achris:master, r=flip1995
Suggest a compatible shell for setup-toolchain.sh

setup-toolchain.sh uses "[[" which is a bash builtin, but the guide
suggests running it with sh.  On Ubuntu, /bin/sh points to dash and
running the script fails.

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*Please keep the line below*
changelog: none
2020-10-19 13:17:07 +00:00
..
2020-10-09 09:40:57 +02:00