Update comment about curl exit codes
commit5272d5ba72b9f98fc0ef9705d5137755077859a7
authorOlly Betts <olly@survex.com>
Fri, 13 Apr 2018 02:00:33 +0000 (13 14:00 +1200)
committerOlly Betts <olly@survex.com>
Fri, 13 Apr 2018 02:02:17 +0000 (13 14:02 +1200)
treead6c71533058b8434cd379bc4651974a2f52ff3c
parent5c836fea68a09acb39466aa7928245d9654ba187
Update comment about curl exit codes

We work around curl --version giving exit code 2, but modern
versions exit with code 0, so document the known bounds on this
change in behaviour.
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