Log Message:
py-jupyter_client: updated to 6.1.5

6.1.2
- Fixed a bug causing clients to sometimes hang after a stop call was made

6.1.1
- Subprocess kill action fix for async execution
- Doc fix for xeus kernel list

6.1.0
This release includes support for asyncio patterns! Downstream tools should soon \ 
have releases to additionally support async patterns.
- AsyncKernelManager and AsyncMultiKernelManager are now available for async \ 
jupyter_client interactions
- Removed unused sphinx dependency
- Added install instructions for pip to documentation
- Improved docs around version protocol and messaging

6.0.0
The git history had to be reworked heavily in merging 5.x and master, so a link \ 
to all the changes at once in github had been left out as it's just confusing.

An exciting change in this release is some async support (huge thanks to \ 
@davidbrochart for doing most of the work)! See linked PR below for more \ 
details, we're working on integrating this into nbclient as well in the near \ 
future.

New Features:
- Added async API

Changes:
- Python 3.8 testing and support added
- Session.msg_id optimization
- Only cache ports if the cache_ports flag is set to True
- Removed direct dependency on pywin32 as this is now in jupyter core

Fixes:
- Prevent two kernels to have the same ports

Docs:
- Document the handling of error in do_execute

Breaking changes:
- Dropped support for Python 2.7!