When choosing version numbers for an npm package, be aware that for dependencies listed in package.json semver ranges won't work below v1.0.0. That is,
"dependencies": {
"my-package": "^0.5"
}
is equivalent to
"dependencies": {
"my-package": "0.5"
}
If you want to be able to use semver ranges, or you want to let other people use them, you might want to start with 1.0.0