Use static package version

Importing the version number as part of the setup routine could break builds when NumPy was not available.

setup.py

@@ -6,8 +6,6 @@ as to build local versions for testing and development.
 
 from setuptools import Extension, setup
 
-from basemesh import __version__
-
 # Load the project README
 with open('README.md', encoding='utf-8') as readme:
     long_description = readme.read()
@@ -34,7 +32,7 @@ package_data = {
 }
 
 setup(name='BASEmesh',
-      version=__version__,
+      version='2.2.0.post1',
       description='Pre-processing and mesh generation toolkit for BASEMENT.',
       long_description=long_description,
       long_description_content_type='text/markdown',