Un-rename ipconfig.io

It doesn't let us download the data from ifconfig.sh for some reason, even
though ipconfig.io works.

Author: jasontbradshaw

providers.json

@@ -4,7 +4,7 @@
     "http://curlmyip.com",
     "http://fmbip.com",
     "http://ifconfig.me",
-    "http://ifconfig.sh",
+    "http://ipconfig.io",
     "http://ip-api.com/csv",
     "http://ipchicken.com",
     "http://ipinfo.io/ip",