Changed VICE SourceForge URL to use HTTPS.

README.md

@@ -7,13 +7,13 @@ Contiki OS for 6502 based computers is available for four target systems. **Sele
 Contiki requires Ethernet hardware. There's no support for TCP/IP over serial connections whatsoever in the standard build. There's experimental support for SLIP instead of Ethernet when building with the environment variable `SLIP` defined.
 
 On the C64 and the C128 there are two supported Ethernet devices:
-- The [RR-Net](http://wiki.icomp.de/wiki/RR-Net) - emulated by [VICE](http://vice-emu.sourceforge.net/)
+- The [RR-Net](http://wiki.icomp.de/wiki/RR-Net) - emulated by [VICE](https://vice-emu.sourceforge.io/)
 - The [ETH64](https://www.ide64.org/eth64.html)
 
 On the Apple //e there are three supported Ethernet cards:
 - The [Uthernet](https://web.archive.org/web/20150323031638/http://a2retrosystems.com/products.htm) - emulated by [AppleWin](https://github.com/AppleWin/AppleWin) and [GSport](https://david-schmidt.github.io/gsport/)
 - The [LANceGS](https://web.archive.org/web/20010331001718/http://lancegs.a2central.com:80/)
-- The [Uthernet II](http://a2retrosystems.com/products.htm)
+- The [Uthernet II](https://a2retrosystems.com/products.htm)
 
 On the ATARI XL there are two supported Ethernet devices:
 - The [Dragon Cart](https://www.atari8ethernet.com/) - emulated by [Altirra](http://www.virtualdub.org/altirra.html)