Gitlab rRest api doesn't accept Project name anymore.

Hello.

Danger is trying to call the Gitlab rest api using the project name. while gitlab now only accepts the project ID as you can see in [the documentation](https://docs.gitlab.com/ce/api/projects.html#get-single-project).

Here is the error, i get.

```
+ danger-swift ci
Error: { HTTPError: Not Found
at fn (/snapshot/danger-js/node_modules/ky/umd.js:242:12)
at process._tickCallback (internal/process/next_tick.js:68:7)
name: 'HTTPError',
response:
Response {
size: 0,
timeout: 0,
[Symbol(Body internals)]: { body: [PassThrough], disturbed: true, error: null },
[Symbol(Response internals)]:
{ url:
'https://gitlab.xxxx.com/api/v4/projects/project%2Fname/merge_requests/15/changes',
status: 404,
statusText: 'Not Found',
headers: [Headers] } },
description: '404 Project Not Found' }
```