With this change, npm gives you an error message if you try to install node-png with node 0.5 or 0.6.
Related to this issue: #12
This package works only with node 0.4 for now. Mark 0.5 and newer uns…
Merge pull request #13 from miikka/patch-1
Mark node 0.5 and newer unsupported in `package.json`