Update default jemalloc version to 4.2.1. fix #87
Update default jemalloc version to 4.2.1. fix #87

treasure-data/omnibus-td-agent,iantalarico/google-fluentd,GoogleCloudPlatform/google-fluentd,iantalarico/google-fluentd,GoogleCloudPlatform/google-fluentd,GoogleCloudPlatform/google-fluentd,treasure-data/omnibus-td-agent,iantalarico/google-fluentd,treasure-data/omnibus-td-agent