update version to 2.1

Author: ploy-np

setup.py

@@ -14,7 +14,7 @@
     name=__pkg_name__,
     license="MIT",
     description='xpore is a python package for Nanopore data analysis of differential RNA modifications.',
-    version='v2.0',
+    version='v2.1',
     long_description=README,
     long_description_content_type='text/markdown',
     url='https://github.com/GoekeLab/xpore',