bump to 0.27.3

[mattdesl]

I've left package.json unchanged so you can npm version patch for tags / etc.

[max-mapper]

sweet thanks. we will also add you as a maintainer so you can help in the future.

our process is exactly what you suggested here:

1. update version in install.js
2. npm version patch
3. git push origin master
4. git push --tags
5. npm publish

[mattdesl]

Great, thanks 👍