Bump version to 0.4.0

Author: hakamine

setup.py

@@ -7,7 +7,7 @@
     author="Artefactual Systems",
     author_email="[email protected]",
     license="AGPL 3",
-    version="0.3.0",
+    version="0.4.0",
     packages=["agentarchives", "agentarchives.archivesspace", "agentarchives.archivists_toolkit", "agentarchives.atom"],
     install_requires=["requests>=2,<3", "mysqlclient>=1.3,<2"],
     classifiers=[