API changed to use Pubkey only. Reflected that change in the rest of the api

filter.go

@@ -3,7 +3,7 @@ package whisper
 import "crypto/ecdsa"
 
 type Filter struct {
-	To     *ecdsa.PrivateKey
+	To     *ecdsa.PublicKey
 	From   *ecdsa.PublicKey
 	Topics [][]byte
 	Fn     func(*Message)

whisper.go

@@ -118,7 +118,7 @@ func (self *Whisper) GetIdentity(key *ecdsa.PublicKey) *ecdsa.PrivateKey {
 
 func (self *Whisper) Watch(opts Filter) int {
 	return self.filters.Install(filter.Generic{
-		Str1: string(crypto.FromECDSA(opts.To)),
+		Str1: string(crypto.FromECDSAPub(opts.To)),
 		Str2: string(crypto.FromECDSAPub(opts.From)),
 		Data: bytesToMap(opts.Topics),
 		Fn: func(data interface{}) {

whisper_test.go

@@ -11,7 +11,7 @@ func TestEvent(t *testing.T) {
 	whisper := New()
 	id := whisper.NewIdentity()
 	whisper.Watch(Filter{
-		To: id,
+		To: &id.PublicKey,
 		Fn: func(msg *Message) {
 			res <- msg
 		},