chore: change .udpdate() method in dictionary

Author: chilango74

okama/common/make_asset_list.py

@@ -259,7 +259,7 @@ def _get_assets_dividends(self, remove_forecast=True) -> pd.DataFrame:
             dic = {}
             for tick in self.symbols:
                 s = self._get_single_asset_dividends(tick, remove_forecast=remove_forecast)
-                dic.update({tick: s})
+                dic[tick] = s
             self._assets_dividends_ts = pd.DataFrame(dic)
         return self._assets_dividends_ts