Version 1.1.3 fails in browser - Buffer is not defined

We wanted to use the package to create hashes in Chrome, but on initial testing it seems like this package doesn't work in the browser.

When attempting to import the package it fails with the error message:

```
Buffer is not defined
```

You can see an minimal example in this Code Sandbox:
https://codesandbox.io/s/x2xyrq2plp