v5.0.0
- Updated for [GitHub's new authorization recommendations](https://developer.github.com/changes/2020-02-10-deprecating-auth-through-query-param)
- Introduced new `githubAuthorizationHeader` method, and renamed `fetch` to `githubQueryString`, and removed default export
- Renamed the package from `githubauthquerystring` to `githubauthreq`
- Minimum required node version changed from `node: >=8` to `node: >=10` to keep up with mandatory ecosystem changes