Servers updater (#232)

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

internal/models/server.go

@@ -35,22 +35,38 @@ type WindscribeServer struct {
 	IPs    []net.IP `json:"ips"`
 }
 
+func (s *WindscribeServer) String() string {
+	return fmt.Sprintf("{Region: %q, IPs: %s}", s.Region, goStringifyIPs(s.IPs))
+}
+
 type SurfsharkServer struct {
 	Region string   `json:"region"`
 	IPs    []net.IP `json:"ips"`
 }
 
+func (s *SurfsharkServer) String() string {
+	return fmt.Sprintf("{Region: %q, IPs: %s}", s.Region, goStringifyIPs(s.IPs))
+}
+
 type CyberghostServer struct {
 	Region string   `json:"region"`
 	Group  string   `json:"group"`
 	IPs    []net.IP `json:"ips"`
 }
 
+func (s *CyberghostServer) String() string {
+	return fmt.Sprintf("{Region: %q, Group: %q, IPs: %s}", s.Region, s.Group, goStringifyIPs(s.IPs))
+}
+
 type VyprvpnServer struct {
 	Region string   `json:"region"`
 	IPs    []net.IP `json:"ips"`
 }
 
+func (s *VyprvpnServer) String() string {
+	return fmt.Sprintf("{Region: %q, IPs: %s}", s.Region, goStringifyIPs(s.IPs))
+}
+
 type NordvpnServer struct { //nolint:maligned
 	Region string `json:"region"`
 	Number uint16 `json:"number"`
@@ -59,6 +75,11 @@ type NordvpnServer struct { //nolint:maligned
 	UDP    bool   `json:"udp"`
 }
 
+func (s *NordvpnServer) String() string {
+	return fmt.Sprintf("{Region: %q, Number: %d, TCP: %t, UDP: %t, IP: %s}",
+		s.Region, s.Number, s.TCP, s.UDP, goStringifyIP(s.IP))
+}
+
 type PurevpnServer struct {
 	Region  string   `json:"region"`
 	Country string   `json:"country"`
@@ -66,6 +87,11 @@ type PurevpnServer struct {
 	IPs     []net.IP `json:"ips"`
 }
 
+func (s *PurevpnServer) String() string {
+	return fmt.Sprintf("{Region: %q, Country: %q, City: %q, IPs: %s}",
+		s.Region, s.Country, s.City, goStringifyIPs(s.IPs))
+}
+
 func goStringifyIP(ip net.IP) string {
 	s := fmt.Sprintf("%#v", ip)
 	s = strings.TrimSuffix(strings.TrimPrefix(s, "net.IP{"), "}")