handle comm_info_request (#97)

* handle comm_info_request

* fix union type

Author: sylvanc

src/IfSharp.Kernel/ShellMessages.fs

@@ -332,6 +332,8 @@ type ConnectReply =
 
 type CommOpen = obj
 
+type CommInfoRequest = obj
+
 type KernelRequest = obj
 
 type KernelReply_LanguageInfo =
@@ -498,6 +500,7 @@ type ShellMessage =
 
     // comm open?
     | CommOpen of CommOpen
+    | CommInfoRequest of CommInfoRequest
 
     // kernel info
     | KernelRequest of KernelRequest
@@ -561,4 +564,6 @@ module ShellMessages =
         //Jupyter 4.x support, do we need to do anything with this?
         | "comm_open"            -> CommOpen (JsonConvert.DeserializeObject<CommOpen>(messageJson))
 
+        | "comm_info_request"    -> CommInfoRequest (JsonConvert.DeserializeObject<CommInfoRequest>(messageJson))
+
         | _                      -> failwith ("Unsupported messageType: " + messageType)