.pyx was removed by sdist

Author: alexlib

MANIFEST.in

@@ -10,6 +10,7 @@ recursive-include openpiv *.ipynb
 recursive-include openpiv *.pdf
 recursive-include openpiv *.png
 recursive-include openpiv *.py
+recursive-include openpiv *.pyx
 recursive-include openpiv *.rst
 recursive-include openpiv *.tif
 recursive-include openpiv *.zip

setup.py

@@ -57,7 +57,7 @@ def finalize_options(self):
 
 
 setup(  name = "OpenPIV",
-        version="0.21.3",
+        version="0.21.3a",
         author = "OpenPIV contributors",
         author_email = "[email protected]",
         description = "An open source software for PIV data analysis",