[DOC] Updated the Ruby gem version for Elasticsearch 0.90.x
[DOC] Updated the Ruby gem version for Elasticsearch 0.90.x

fubuki/elasticsearch,fubuki/elasticsearch,fubuki/elasticsearch,aparo/elasticsearch,aparo/elasticsearch,vorce/es-metrics,fubuki/elasticsearch,fubuki/elasticsearch,aparo/elasticsearch,vorce/es-metrics,fubuki/elasticsearch,vorce/es-metrics,aparo/elasticsearch,vorce/es-metrics,aparo/elasticsearch,vorce/es-metrics,aparo/elasticsearch