Update setup.py

Author: alexlib

setup.py

@@ -18,12 +18,13 @@
 # read the contents of your README file
 from os import path
 this_directory = path.abspath(path.dirname(__file__))
-with open(path.join(this_directory, 'README.md'), encoding='utf-8') as f:
+#with open(path.join(this_directory, 'README.md'), encoding='utf-8') as f:
+with open(path.join(this_directory, 'README.md')) as f:
     long_description = f.read()
 
 setup(
     name = "OpenPIV",
-    version ='0.21.8',
+    version ='0.21.8b',
     cmdclass = {'build_ext': build_ext},
     ext_modules = extensions,
     packages=find_packages(),