v0.2.3 patch release with multiprocessing fixed => remove python version constraint

Author: VictorSanh

setup.py

@@ -26,7 +26,7 @@
 
 setup(
     name='promptsource',
-    version='0.2.2',
+    version='0.2.3',
     url='https://github.com/bigscience-workshop/promptsource.git',
     author='BigScience - Prompt Engineering Working Group',
     author_email='[email protected],[email protected]',