Merge pull request #80 from davidbrochart/v0.4.0a1

Release 0.4.0a1

Author: davidbrochart

docs/changelog.md

@@ -4,9 +4,14 @@
 
 ### Major Changes
 
+- Use KernelManager's graceful shutdown rather than KILLing kernels [#64](https://github.com/jupyter/nbclient/pull/64)
 - Mimic an Output widget at the frontend so that the Output widget behaves correctly [#68](https://github.com/jupyter/nbclient/pull/68)
 - Nested asyncio is automatic, and works with Tornado [#71](https://github.com/jupyter/nbclient/pull/71)
 
+### Fixes
+
+- Fix `OSError: [WinError 6] The handle is invalid` for windows/python<3.7 [#77](https://github.com/jupyter/nbclient/pull/77)
+
 ## 0.3.1
 
 ### Fixes

nbclient/_version.py

@@ -1 +1 @@
-version = '0.4.0a0'
+version = '0.4.0a1'