README - port, timeout.
README - port, timeout.

Manual merge of https://github.com/jroes/gosnmp patch-1
(was against alouca not soniah).
Thanks to jroes@jroes.net.

virtuallynathan/gosnmp_virtuallynathan,MrSpock/gosnmp,mgenov/gosnmp,jda/gosnmp,virtuallynathan/gosnmp_virtuallynathan,MrSpock/gosnmp,jda/gosnmp,wdreeveii/gosnmp-sonia,mgenov/gosnmp