Use filippo.io/edwards25519 for ed25519

Author: crossle

go.mod

@@ -3,8 +3,8 @@ module github.com/MixinNetwork/bot-api-go-client
 go 1.15
 
 require (
+	filippo.io/edwards25519 v1.0.0-beta.2
 	github.com/MixinNetwork/go-number v0.0.0-20180814121220-f48e2574d9ef
-	github.com/MixinNetwork/mixin v0.9.0
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
 	github.com/gofrs/uuid v3.4.0+incompatible
 	github.com/gorilla/websocket v1.4.2