raftexample: remove snapshot TODO in README

contrib/raftexample/README.md

@@ -113,7 +113,3 @@ When the REST server submits a proposal, the raft server transmits the proposal
 When raft reaches a consensus, the server publishes all committed updates over a commit channel.
 For raftexample, this commit channel is consumed by the key-value store.
 
-## Project Details
-
-### TODO
-- Snapshot support