fix: make outbound peer id optional (#294)

In order to support connecting to mulitaddrs without a peer id
make the remote peer id an optional argument when securing the
outbound connection.

packages/interface-connection-encrypter/src/index.ts

@@ -9,12 +9,16 @@ export interface ConnectionEncrypter {
   protocol: string
 
   /**
-   * Encrypt outgoing data to the remote party.
+   * Encrypt outgoing data to the remote party. If the remote PeerId is known,
+   * pass it for extra verification, otherwise it will be determined during
+   * the handshake.
    */
-  secureOutbound: (localPeer: PeerId, connection: Duplex<Uint8Array>, remotePeer: PeerId) => Promise<SecuredConnection>
+  secureOutbound: (localPeer: PeerId, connection: Duplex<Uint8Array>, remotePeer?: PeerId) => Promise<SecuredConnection>
 
   /**
-   * Decrypt incoming data.
+   * Decrypt incoming data. If the remote PeerId is known,
+   * pass it for extra verification, otherwise it will be determined during
+   * the handshake
    */
   secureInbound: (localPeer: PeerId, connection: Duplex<Uint8Array>, remotePeer?: PeerId) => Promise<SecuredConnection>
 }