Installing typings globally overrides /usr/bin/touch #195

Currently typings depends on typings-core which in turn depends on touch@^1.0.0. Pre-2.0, touch installs a binary named touch. Thus, if you install typings globally, for people using something like nvm, that means that the node script version of touch will override the built-in /usr/bin/touch. The node script prints a lot of debug info, causing issues like Homebrew/brew#2891.

Upgrading to v2 or v3 of touch will fix this issue as that package has renamed its binary to nodetouch.

I believe #188 would fix this issue.