Merge #365: Fix crash when pushing TX via "not-self"

1caf0da Fix crash when pushing TX via "not-self" (AlexCato)

Tree-SHA512: 7f9033993602071c81b6526a2b35a5ed1ee7eb9bbd9bc937fe7838d11b3091acaec46ee0ecebc4136470fe5dd70540acbbda8458e8250b5e76c248499fba63c5

jmclient/jmclient/taker.py

@@ -801,7 +801,7 @@ class Taker(object):
             if i == n:
                 pushed = jm_single().bc_interface.pushtx(tx)
             else:
-                nick_to_use = self.maker_utxo_data.keys()[i]
+                nick_to_use = list(self.maker_utxo_data.keys())[i]
                 pushed = True
         else:
             jlog.info("Only self, random-peer and not-self broadcast "