REF: Avoid deprecated pandas.Index.__or__

Author: kernc

backtesting/_plotting.py

@@ -299,7 +299,7 @@ def _plot_equity_section(is_return=False):
                 # Include max dd end points. Otherwise the MaxDD line looks amiss.
                 dd_start, int(dd_end), min(int(dd_end + 1), equity.size - 1),
             ])
-            select = pd.Index(trades['ExitBar']) | interest_points
+            select = pd.Index(trades['ExitBar']).union(interest_points)
             select = select.unique().dropna()
             equity = equity.iloc[select].reindex(equity.index)
             equity.interpolate(inplace=True)

backtesting/lib.py

@@ -284,7 +284,7 @@ def wrap_func(resampled, *args, **kwargs):
         # Resample back to data index
         if not isinstance(result.index, pd.DatetimeIndex):
             result.index = resampled.index
-        result = result.reindex(index=series.index | resampled.index,
+        result = result.reindex(index=series.index.union(resampled.index),
                                 method='ffill').reindex(series.index)
         return result