Servers updater (#232)

* Support for all VPN providers
* Update all VPN providers servers information
* Remove old tooling binaries

internal/updater/ips.go

@@ -0,0 +1,24 @@
+package updater
+
+import (
+	"bytes"
+	"net"
+	"sort"
+)
+
+func uniqueSortedIPs(ips []net.IP) []net.IP {
+	uniqueIPs := make(map[string]struct{})
+	for _, ip := range ips {
+		uniqueIPs[ip.String()] = struct{}{}
+	}
+	ips = make([]net.IP, len(uniqueIPs))
+	i := 0
+	for ip := range uniqueIPs {
+		ips[i] = net.ParseIP(ip)
+		i++
+	}
+	sort.Slice(ips, func(i, j int) bool {
+		return bytes.Compare(ips[i], ips[j]) < 0
+	})
+	return ips
+}