fix statement on upgrading to 1.5.0 around GC
fix statement on upgrading to 1.5.0 around GC

yangchengjian/riak_cs,sdebnath/riak_cs,dragonfax/riak_cs,basho/riak_cs,laurenrother/riak_cs,basho/riak_cs,dragonfax/riak_cs,GabrielNicolasAvellaneda/riak_cs,GabrielNicolasAvellaneda/riak_cs,laurenrother/riak_cs,basho/riak_cs,yangchengjian/riak_cs,sdebnath/riak_cs,laurenrother/riak_cs,sdebnath/riak_cs,dragonfax/riak_cs,sdebnath/riak_cs,GabrielNicolasAvellaneda/riak_cs,GabrielNicolasAvellaneda/riak_cs,laurenrother/riak_cs,dragonfax/riak_cs,yangchengjian/riak_cs,yangchengjian/riak_cs,basho/riak_cs