Expose delete channel to CLI

README.md

@@ -154,6 +154,8 @@ Available Commands:
 Flags:
       --accept-channel            Accept the channel request for the
                                   corresponding recipient ID
+      --delete-channel            Delete the channel information for the
+                                  corresponding recipient ID                            
       --destfile string           Read this contact file for the destination id
   -d, --destid string             ID to send message to (if below 40, will be
                                   precanned. Use '0x' or 'b64:' for hex and