Set default endpoint

config.go

@@ -42,5 +42,9 @@ func CreateConfig(path string, cfg *Config) {
 		cfg.Zerooo.Location = filepath.Join(filepath.Dir(path), cfg.Zerooo.Location)
 	}
 
+	if cfg.Zerooo.Endpoint == "" {
+		cfg.Zerooo.Endpoint = "https://zer.ooo"
+	}
+
 	Check(err, "Couldn't parse %q, err: %s", path, err)
 }