fix README.md

fix UnusedID returning wrong ID

fix UnusedID returning wrong ID

Merge pull request #27 from HPInc/support-uint32

Use uint32 instead of uint24 for triangle props

add WriteCloser

Merge pull request #25 from HPInc/fix-prod

Fix data race in ValidateCoherency

Merge pull request #24 from HPInc/fix-prod

Skip empty production path encoding

Merge pull request #23 from HPInc/update-module-name

Rename module to github.com/hpinc/go3mf