update mint, and adapt to the new use of the extension handler

vendor/github.com/bifurcation/mint/state-machine.go

@@ -1,6 +1,7 @@
 package mint
 
 import (
+	"crypto/x509"
 	"time"
 )
 
@@ -44,30 +45,6 @@ type AppExtensionHandler interface {
 	Receive(hs HandshakeType, el *ExtensionList) error
 }
 
-// Capabilities objects represent the capabilities of a TLS client or server,
-// as an input to TLS negotiation
-type Capabilities struct {
-	// For both client and server
-	CipherSuites     []CipherSuite
-	Groups           []NamedGroup
-	SignatureSchemes []SignatureScheme
-	PSKs             PreSharedKeyCache
-	Certificates     []*Certificate
-	AuthCertificate  func(chain []CertificateEntry) error
-	ExtensionHandler AppExtensionHandler
-	UseDTLS          bool
-	// For client
-	PSKModes []PSKKeyExchangeMode
-
-	// For server
-	NextProtos        []string
-	AllowEarlyData    bool
-	RequireCookie     bool
-	CookieProtector   CookieProtector
-	CookieHandler     CookieHandler
-	RequireClientAuth bool
-}
-
 // ConnectionOptions objects represent per-connection settings for a client
 // initiating a connection
 type ConnectionOptions struct {
@@ -114,6 +91,8 @@ type StateConnected struct {
 	clientTrafficSecret []byte
 	serverTrafficSecret []byte
 	exporterSecret      []byte
+	peerCertificates    []*x509.Certificate
+	verifiedChains      [][]*x509.Certificate
 }
 
 var _ HandshakeState = &StateConnected{}