docs: add in the api docs entry for anomalous version heuristic (#967)

Add in the API docs for the anomalous version heuristic.

Author: art1f1c3R

docs/source/pages/developers_guide/apidoc/macaron.malware_analyzer.pypi_heuristics.metadata.rst

@@ -9,6 +9,14 @@ macaron.malware\_analyzer.pypi\_heuristics.metadata package
 Submodules
 ----------
 
+macaron.malware\_analyzer.pypi\_heuristics.metadata.anomalous\_version module
+-----------------------------------------------------------------------------
+
+.. automodule:: macaron.malware_analyzer.pypi_heuristics.metadata.anomalous_version
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
 macaron.malware\_analyzer.pypi\_heuristics.metadata.closer\_release\_join\_date module
 --------------------------------------------------------------------------------------