added glaringly missing opts.port to documentation
added glaringly missing opts.port to documentation

mk-pmb/node-ecstatic,mk-pmb/node-ecstatic,jfhbrook/node-ecstatic,dotnetCarpenter/node-ecstatic,jfhbrook/node-ecstatic,dotnetCarpenter/node-ecstatic,jfhbrook/node-ecstatic,mk-pmb/node-ecstatic,dotnetCarpenter/node-ecstatic