DOC: Minor typo fix s/proided/provided/ (#22)

Author: AndreMiras

backtesting/backtesting.py

@@ -935,7 +935,7 @@ def plot(self, *, results: pd.Series = None, filename=None, plot_width=None,
         """
         Plot the progression of the last backtest run.
 
-        If `results` is proided, it should be a particular result
+        If `results` is provided, it should be a particular result
         `pd.Series` such as returned by
         `backtesting.backtesting.Backtest.run` or
         `backtesting.backtesting.Backtest.optimize`, otherwise the last