Update README.md

Author: scls19fr

README.md

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 APC Network Power Management Controller
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-[![Build Status](https://travis-ci.org/scls19fr/APC.svg?branch=master)](https://travis-ci.org/scls19fr/APC)
+[![Build Status](https://travis-ci.com/scls19fr/APC.svg?branch=master)](https://travis-ci.com/scls19fr/APC)
 
 Controls rebooting of APC network PDU switches with 'telnet' network interface.
 Tested with the AP7900, but likely works with other models.