processx 3.3.0

process can now redirect the standard error to the standard output, via
specifying stderr = "2>&1". This works both with files and pipes.
run() can now redirect the standard error to the standard output, via
the new stderr_to_stdout argument.
The $kill() and $kill_tree() methods get a close_connection = TRUE
argument that closes all pipe connections of the process.
run() now always kills the process (and its process tree if
cleanup_tree is TRUE) before exiting. This also closes all
pipe connections (#149).

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