Version 0.4.2
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 * Fix compatibility with Python 3.9


Version 0.4.1
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 * Change licence to more permissive (MIT)


Version 0.4
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 * psys.pipe module
 * psys.process module
 * psys.daemon.write_pidfile() and psys.daemonize() functions


Version 0.3
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 * pcore has been separated to an independent package


Version 0.2
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 * psys.daemon module


Version 0.1.1
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 * psys.poll: handle missing EPOLLHUP and EPOLLERR


Version 0.1
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 * Initial release: psys has been separated from psh
