Servers updater (#232)

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

internal/updater/alias.go

@@ -0,0 +1,12 @@
+package updater
+
+import (
+	"context"
+	"net"
+	"net/http"
+)
+
+type (
+	httpGetFunc  func(url string) (r *http.Response, err error)
+	lookupIPFunc func(ctx context.Context, host string) (ips []net.IP, err error)
+)