get-installed-path is failing to find html-sketchapp
Error message I get upon `html-sketchapp install`

```
(node:6987) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): Error: get-installed-path: module not found "html-sketchapp" in path /Users/jayfallon/.nvm/versions/node/v8.1.4/lib/node_modules/html-sketchapp
(node:6987) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
```