Log Message:
Update to 0.20.1:

Devil's Pie "Wearing That Dress" 0.20.1
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* Fix parsing (Lars Damerow)
* Fix test suite

Devil's Pie "Wearing That Dress" 0.20
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* Handle multiple expressions in a file (Lars Damerow)
* Add spawn_sync and spawn_async actions to start processes (David Decotigny)
* Add println, str, hex, and expand print (DD)
* Add window_xid matcher (DD)