Log Message:
py-ipykernel: updated to 5.1.3

5.1.3 Includes several bugfixes and internal logic improvements.
- Fix comm shutdown behavior by adding a ``deleting`` option to ``close`` which \ 
can be set to prevent registering new comm channels during shutdown
- Fix ``Heartbeat._bind_socket`` to return on the first bind
- Moved ``InProcessKernelClient.flush`` to ``DummySocket``
- Don't redirect stdout if nose machinery is not present
- Rename `_asyncio.py` to `_asyncio_utils.py` to avoid name conflicts on Python 3.6+
- Only generate kernelspec when installing or building wheel
- Fix priority ordering of control-channel messages in some cases