Bump version

Author: Legrandin

lib/Crypto/__init__.py

@@ -1,6 +1,6 @@
 __all__ = ['Cipher', 'Hash', 'Protocol', 'PublicKey', 'Util', 'Signature',
            'IO', 'Math']
 
-version_info = (3, 19, '1b0')
+version_info = (3, 20, '0b0')
 
 __version__ = ".".join([str(x) for x in version_info])