Added options symbols to get_assets

piker/brokers/deribit/api.py

@@ -321,6 +321,15 @@ class Client:
                 name=name,
                 atype=atype,
                 tx_tick=tx_tick)
+
+            instruments = await self.symbol_info(currency=name.lower())
+            for instrument in instruments:
+                pair = instruments[instrument]
+                assets[pair.symbol] = Asset(
+                    name=pair.symbol,
+                    atype='option',
+                    tx_tick=pair.size_tick)
+
         return assets 
 
     async def get_mkt_pairs(self) -> dict[str, Pair]: