Check if a URL is absolute
$ npm install is-absolute-url
```js const isAbsoluteUrl = require('is-absolute-url');
isAbsoluteUrl('https://sindresorhus.com/foo/bar'); //=> true
isAbsoluteUrl('//sindresorhus.com'); //=> false
isAbsoluteUrl('foo/bar'); //=> false ```
See is-relative-url for the inverse.