Load Cert for TLS client.go

// loadTLSCfg will load a certificate and create a tls config
func loadTLSCfg() *tls.Config {
	b, _ := ioutil.ReadFile("../cert/server.crt")
	cp := x509.NewCertPool()
	if !cp.AppendCertsFromPEM(b) {
		log.Fatal("credentials: failed to append certificates")
	}
	config := &tls.Config{
		InsecureSkipVerify: false,
		RootCAs:            cp,
	}
	return config
}