Add error to strategy index.

drvinceknight · drvinceknight · commit 0c2e5dd967b9 · 2020-04-06T20:36:00.000+01:00
diff --git a/docs/reference/all_strategies.rst b/docs/reference/all_strategies.rst
@@ -116,5 +116,3 @@ Here are the docstrings of all the strategies in the library.
    :members:
 .. automodule:: axelrod.strategies.worse_and_worse
    :members:
-.. automodule:: axelrod.strategies.zero_determinant
-   :members:
