Fix typo (#29)

Author: gabalafou

_goals/96_client_server.md

@@ -5,5 +5,5 @@ Bokeh uses Tornado and WebSockets for communication between the server and clien
 code to serialize/deserialize messages.
 It would be beneficial to decouple Bokeh functionality from the communication implementation and
 allow others such as those based on Jupyter and ZeroMQ for example.
-This would require a review and specification of the required communcation and serialization
+This would require a review and specification of the required communication and serialization
 functionality, and at least two pluggable implementations, one of which would be the current one.