add InProcessKernel to kernel.inprocess

IPython/kernel/inprocess/__init__.py

@@ -4,5 +4,6 b' from .channels import ('
     InProcessStdInChannel,
     InProcessHBChannel,
 )
+from .ipkernel import InProcessKernel
 from .client import InProcessKernelClient
 from .manager import InProcessKernelManager
  No newline at end of file