Fix dht findpeer api

Author: ianopolous

src/main/java/io/ipfs/api/IPFS.java

@@ -387,8 +387,8 @@ public Map query(MultiAddress addr) throws IOException {
             return retrieveMap("dht/query?arg=" + addr.toString());
         }
 
-        public Map findpeer(MultiAddress addr) throws IOException {
-            return retrieveMap("dht/findpeer?arg=" + addr.toString());
+        public Map findpeer(Multihash id) throws IOException {
+            return retrieveMap("dht/findpeer?arg=" + id.toString());
         }
 
         public Map get(Multihash hash) throws IOException {

src/test/java/io/ipfs/api/APITest.java

@@ -589,7 +589,7 @@ public void dhtTest() throws IOException {
         Map findprovs = ipfs.dht.findprovs(pointer);
         List<Peer> peers = ipfs.swarm.peers();
         Map query = ipfs.dht.query(peers.get(0).address);
-//        Map find = ipfs.dht.findpeer(peers.get(0));
+        Map find = ipfs.dht.findpeer(peers.get(0).id);
     }
 
     @Test