fix: stripping the SIG prefix for POSIX compliance

[knight]

changes which fix #956

[knight]

@remy is this PR any good?

[remy]

Super late to this PR, but can you let me know why this would be needed? Is it causing breaking elsewhere? (genuine question).

[knight]

On Linux auto re-spawning after detected changes does not work because sh does not recognize the SIGNAL constants with prefix. Please see my comments on the issue #956

[heisian]

@knight why not do it the way an answer in the link you referenced suggests?

#!/bin/sh

set -x
set +o posix
sleep 100 &
pid=$!
kill -s SIGSTOP "$pid"
sleep 2
kill -s SIGCONT "$pid"
set -o posix

[remy]

Fixed (alternative method) in nodemon@1.13.2