also add VERSION, in setup() too

Author: dimpase

MANIFEST.in

@@ -1,3 +1,4 @@
 include AUTHORS
+include VERSION
 include setup.py pyproject.toml
 graft primecountpy

setup.py

@@ -32,6 +32,7 @@ def run(self):
 setup(
     name='primecountpy',
     description='Cython interface for C++ primecount library',
+    version=version,
     long_description=long_description,
     long_description_content_type='text/markdown',
     url='https://github.com/dimpase/primecountpy',