update version to 0.3.1 since is a fork
update version to 0.3.1 since is a fork

Kaliber/scala-pdf,secutix/play20-pdf,laguiz/play20-pdf,joergviola/play20-pdf,ilaborie/play20-pdf,innoveit/play2-pdf,fhars/play20-pdf,builtamont-oss/play2-scala-pdf,benjohnde/play20-pdf,builtamont-oss/play2-scala-pdf,benjohnde/play20-pdf