Clarify fork instructions in contributing docs

NitantP · NitantP · commit 11a72fb11d48 · 2023-03-02T00:48:19.000-05:00
`setup.py` expects to be able to find git tags in order to properly set
the package version. If a fork does not have any tags, `pip install -e
.` will fail due to the default `"unknown"` being an invalid version.
diff --git a/doc/sphinx/source/contributing.rst b/doc/sphinx/source/contributing.rst
@@ -30,7 +30,10 @@ environment with
     # necessary every time you work on bpython
     $ source bpython-dev/bin/activate
 
-Fork bpython in the GitHub web interface, then clone the repo:
+Fork bpython in the GitHub web interface. Be sure to include the tags
+in your fork by un-selecting the option to copy only the main branch.
+
+Then, clone the forked repo:
 
 .. code-block:: bash
 
