Bump to next development cycle

Author: hanslovsky

setup.py

@@ -8,7 +8,7 @@
 
 setup(
     name='jgo',
-    version='0.3.0',
+    version='0.3.1.dev0',
     author='Philipp Hanslovsky, Curtis Rueden',
     author_email='hanslovskyp@janelia.hhmi.org',
     description='Launch Java code from Python and the CLI, installation-free.',