odd cut and paste error fixed.

freqtrade/exchange/__init__.py

@@ -70,6 +70,10 @@ class Exchange(object):
         # Check if all pairs are available
         self.validate_pairs(config['exchange']['pair_whitelist'])
 
+        if config.get('ticker_interval'):
+            # Check if timeframe is available
+            self.validate_timeframes(config['ticker_interval'])
+
     def _init_ccxt(self, exchange_config: dict) -> ccxt.Exchange:
         """
         Initialize ccxt with given config and return valid