Support go1.4

Author: winlinvip

.travis.yml

@@ -1,7 +1,7 @@
 language: go
 
 go:
-  - 1.3
+  - 1.4
   - 1.7
   - 1.8
 

https/acme/crypto.go

@@ -131,9 +131,9 @@ func getKeyAuthorization(token string, key interface{}) (string, error) {
 	var publicKey crypto.PublicKey
 	switch k := key.(type) {
 	case *ecdsa.PrivateKey:
-		publicKey = &k.PublicKey
+		publicKey = k.Public()
 	case *rsa.PrivateKey:
-		publicKey = &k.PublicKey
+		publicKey = k.Public()
 	}
 
 	// Generate the Key Authorization for the challenge

https/letsencrypt/lets.go

@@ -336,7 +336,7 @@ func (m *Manager) CacheFile(name string) error {
 		}
 	}
 	go func() {
-		for _ = range m.Watch() {
+		for range m.Watch() {
 			err := ioutil.WriteFile(name, []byte(m.Marshal()), 0600)
 			if err != nil {
 				log.Printf("writing letsencrypt cache: %v", err)