BF: manifest (for zip files) should include tests/data/*.psyexp

MANIFEST.in

@@ -20,7 +20,7 @@ recursive-include psychopy/demos/builder *.psyexp *.csv *.xlsx *.wav *.yaml
 
 recursive-include psychopy/preferences *.spec
 
-recursive-include psychopy/tests *.mp4 *.mov *.jpg
+recursive-include psychopy/tests *.mp4 *.mov *.jpg *.psyexp
 
 recursive-include docs *.rst *.py
 recursive-include docs *.rst *.py