outBytes of type int

[william-yang]

nginx_exporter 0.6 version

if nginx's outBytes > 2 147 483 648 ; than nginx_exporter error

errorlog:
2017/11/02 20:20:08 json.Unmarshal failed json: cannot unmarshal number 2251611814 into Go struct field Server.outBytes of type int
2017/11/02 20:20:23 json.Unmarshal failed json: cannot unmarshal number 2251765921 into Go struct field Server.outBytes of type int

[sysulq]

Thanks for reporting, and pull request is welcome :-)