Fix version handling (#15)

Co-authored-by: Frédéric Collonval <[email protected]>

Author: Frédéric Collonval

jupyter_kernel_client/__init__.py

@@ -4,6 +4,7 @@
 
 """Jupyter Kernel Client through websocket."""
 
+from ._version import __version__
 from .client import KernelClient
 from .konsoleapp import KonsoleApp
 from .manager import KernelHttpManager
@@ -19,4 +20,5 @@
     "KonsoleApp",
     "LanguageSnippets",
     "VariableDescription",
+    "__version__",
 ]