Only core contributors may release to NPM.
To release a new version on NPM, first ensure all tests pass with npm test,
then use npm version patch|minor|major in order to increment the version in
package.json and tag and commit a release. Then git push && git push --tags
this change so Travis CI can deploy to NPM. Do not run npm publish directly.
Once published, add release notes.
Use semver to determine which version part to increment.
Example for a patch release:
npm test
npm version patch
git push --follow-tags