cryptonote_core: change wording of fork warning message

An udpate may or may not be available now, but should be soon if not.
This will prevent too many people freaking out.

src/cryptonote_core/cryptonote_core.cpp

@@ -1388,7 +1388,7 @@ namespace cryptonote
         break;
       case HardFork::UpdateNeeded:
         MCLOG_RED(level, "global", "**********************************************************************");
-        MCLOG_RED(level, "global", "Last scheduled hard fork time shows a daemon update is needed now.");
+        MCLOG_RED(level, "global", "Last scheduled hard fork time shows a daemon update is needed soon.");
         MCLOG_RED(level, "global", "**********************************************************************");
         break;
       default: