Prepare for a patch version. (#421)

We got some fixes yesterday to test on Colab. Doing a patch release to
re-test before the final release.

Signed-off-by: Mihai Maruseac <[email protected]>

Author: mihaimaruseac

src/model_signing/__init__.py

@@ -26,7 +26,7 @@
 from model_signing import verifying
 
 
-__version__ = "0.3.0"
+__version__ = "0.3.1"
 
 
 __all__ = ["hashing", "signing", "verifying"]