deprecate ccxt_rate_limt

freqtrade/configuration.py

@@ -271,6 +271,11 @@ class Configuration(object):
             raise OperationalException(
                 exception_msg
             )
+        # Depreciation warning
+        if 'ccxt_rate_limit' in config.get('exchange', {}):
+            logger.warning("`ccxt_rate_limit` has been deprecated in favor of "
+                           "`ccxt_config` and `ccxt_async_config` and will be removed "
+                           "in future a future version.")
 
         logger.debug('Exchange "%s" supported', exchange)
         return True