updating DIRECTORY.md

Author: cclauss

DIRECTORY.md

@@ -449,8 +449,10 @@
   * [Equated Monthly Installments](financial/equated_monthly_installments.py)
   * [Exponential Moving Average](financial/exponential_moving_average.py)
   * [Interest](financial/interest.py)
+  * [Kelly Criterion](financial/kelly_criterion.py)
   * [Present Value](financial/present_value.py)
   * [Price Plus Tax](financial/price_plus_tax.py)
+  * [Sharpe Ratio](financial/sharpe_ratio.py)
   * [Simple Moving Average](financial/simple_moving_average.py)
   * [Straight Line Depreciation](financial/straight_line_depreciation.py)
   * [Time And Half Pay](financial/time_and_half_pay.py)