Removed outdated link http://www.quicknet.net from README.md
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Supported telephony hardware includes:
* All Analog and Digital Interface cards from [Sangoma]
-* QuickNet Internet PhoneJack and LineJack (http://www.quicknet.net)
+* QuickNet Internet PhoneJack and LineJack
* any full duplex sound card supported by ALSA, OSS, or PortAudio
* any ISDN card supported by mISDN on Linux
* The Xorcom Astribank channel bank