Merge #355: Trivial: hint for bitcoin-cli rescanblockchain in restart_msg

d909f62 Hint for `bitcoin-cli rescanblockchain` in `restart_msg` (Kristaps Kaupe)

Tree-SHA512: d8b124dd01b17480f219d0bab1ec8e0164ededc6641d80d96202ba262baec70e1f545623c0219d44f71adceb8ad41b610d16c6b9d39d71d65cb0f7aa17c7c3a4

jmclient/jmclient/blockchaininterface.py

@@ -395,7 +395,8 @@ class BitcoinCoreInterface(BlockchainInterface):
         if jm_single().config.get("BLOCKCHAIN",
                                   "blockchain_source") != 'regtest': #pragma: no cover
             #Exit conditions cannot be included in tests
-            restart_msg = ("restart Bitcoin Core with -rescan if you're "
+            restart_msg = ("restart Bitcoin Core with -rescan or use "
+                           "`bitcoin-cli rescanblockchain` if you're "
                            "recovering an existing wallet from backup seed\n"
                            "Otherwise just restart this joinmarket application.")
             if restart_cb: