Include sys_ptrace capability information in the error #121
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Add a more helpful message when permission denied errors arise. See #119 for a little background.
Note: This is a Linux specific error that came up for me under docker. Fix it in docker with
docker run --cap-add SYS_PTRACE
Note to future me: To see the currently allowed capabilities use
capsh --print
and for this issue look for cap_sys_ptrace. If it isn't there this error message should happen.