Bump version to dev

rocky · rocky · commit 5682345f3471 · 2021-05-15T19:45:10.000-04:00
diff --git a/mathics/version.py b/mathics/version.py
@@ -4,4 +4,4 @@
 # This file is suitable for sourcing inside POSIX shell as
 # well as importing into Python. That's why there is no
 # space around "=" below.
-__version__="2.2.0"  # noqa
+__version__="2.2.1.dev0"  # noqa
