Add client version as argument

main.go

@@ -14,8 +14,6 @@ import (
 	"git.vh7.uk/jakew/echo-go/crypto"
 )
 
-const EchoVersion = "3.17"
-
 func randomHex(n int) (string, error) {
 	b := make([]byte, n)
 	if _, err := rand.Read(b); err != nil {
@@ -141,7 +139,7 @@ func (c *Client) Receive() ([]RawMessage, error) {
 	return messages, nil
 }
 
-func (c *Client) HandshakeLoop(password string) error {
+func (c *Client) HandshakeLoop(clientVersion string, password string) error {
 	log.Println("sending server info request")
 	err := c.SendPlain(ReqServerInfo, nil, nil, nil)
 	if err != nil {
@@ -175,7 +173,7 @@ func (c *Client) HandshakeLoop(password string) error {
 				data, err := json.Marshal([]string{
 					c.Username,
 					password,
-					EchoVersion,
+					clientVersion,
 				})
 				if err != nil {
 					return err

main_test.go

@@ -8,7 +8,7 @@ func TestCanConnect(t *testing.T) {
 		t.Fatalf("failed to create client: %v", err)
 	}
 
-	err = client.handshakeLoop("mypassword")
+	err = client.HandshakeLoop("mypassword", "4.0.0")
 	if err != nil {
 		t.Fatalf("failed to run handshake loop: %v", err)
 	}