explicitly allow '*' in specs for clique_usage:register/2 (#3)

else, dialyzer will complain about specs like this:

clique:register_usage(["riak-admin", "tictacaae", "rebuild-schedule",
                      '*'], ...)

Author: hmmr

src/clique.erl

@@ -86,7 +86,7 @@ register_command(Cmd, Keys, Flags, Fun) ->
 
 %% @doc Register usage for a given command sequence. Lookups are by longest
 %% match.
--spec register_usage([string()], clique_usage:usage()) -> true.
+-spec register_usage([string()|'*'], clique_usage:usage()) -> true.
 register_usage(Cmd, Usage) ->
     clique_usage:register(Cmd, Usage).
 

src/clique_usage.erl

@@ -56,7 +56,7 @@ teardown() ->
 
 %% @doc Register usage for a given command sequence. Lookups are by longest
 %% match.
--spec register([string()], usage()) -> true.
+-spec register([string()|'*'], usage()) -> true.
 register(Cmd, Usage) ->
     ets:insert(?usage_table, {Cmd, Usage}).