Replace ticker_interval with timeframe in sample configs

config.json.example

@@ -4,7 +4,7 @@
     "stake_amount": 0.05,
     "tradable_balance_ratio": 0.99,
     "fiat_display_currency": "USD",
-    "ticker_interval": "5m",
+    "timeframe": "5m",
     "dry_run": false,
     "cancel_open_orders_on_exit": false,
     "trailing_stop": false,

config_binance.json.example

@@ -4,7 +4,7 @@
     "stake_amount": 0.05,
     "tradable_balance_ratio": 0.99,
     "fiat_display_currency": "USD",
-    "ticker_interval": "5m",
+    "timeframe": "5m",
     "dry_run": true,
     "cancel_open_orders_on_exit": false,
     "trailing_stop": false,

config_full.json.example

@@ -9,7 +9,7 @@
     "last_stake_amount_min_ratio": 0.5,
     "dry_run": false,
     "cancel_open_orders_on_exit": false,
-    "ticker_interval": "5m",
+    "timeframe": "5m",
     "trailing_stop": false,
     "trailing_stop_positive": 0.005,
     "trailing_stop_positive_offset": 0.0051,

config_kraken.json.example

@@ -4,7 +4,7 @@
     "stake_amount": 10,
     "tradable_balance_ratio": 0.99,
     "fiat_display_currency": "EUR",
-    "ticker_interval": "5m",
+    "timeframe": "5m",
     "dry_run": true,
     "cancel_open_orders_on_exit": false,
     "trailing_stop": false,