Correct the version in setup.py

Author: shrikantjoshi-hpe

tools/marvin/setup.py

@@ -27,7 +27,7 @@
         raise RuntimeError("python setuptools is required to build Marvin")
 
 
-VERSION = "4.21.0.0"
+VERSION = "4.21.0.0-SNAPSHOT"
 
 setup(name="Marvin",
       version=VERSION,