Upgrade to semver 1.0.0

Annoying nit pick, but I want to switch game-shell to use this instead of the clumsy built in polyfill right now.  However, I am trying to make sure that going forward everything in the whole gl-* dependency chain is semver compliant so that I can use "^" to handle upgrades.

Can you republish this module with a semver >=1.0.0?