Fix const in parser
Fix const in parser

apcera/go-junit-report,tadukurow/go-junit-report,jstemmer/go-junit-report,thsnr/go-junit-report,ngoossens/go-junit-report,sectioneight/go-junit-report,istio/go-junit-report,lobatt/go-junit-report,shaunmza/go-junit-report,Thermeon/go-junit-report