Fix bug for Renamed imported object if it has the same name as module #91

[jennykhanhnguyen]

This PR fixes an issue where using '.rename()' on a module name would also rename the imported object.

Before:
from commonmark.main import commonmark -> from testme.main import testme

After fix:
from commonmark.main import commonmark -> from testme.main import commonmark

Also includes a test to ensure this bug does not occur again.

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