Bring back relative files

[orta]

Again, as with #355 I'm a bit confused that this seemed to just work...

[DangerCI]

	Fails
🚫	Danger failed to run dangerfile.ts.

Error VMError

Cannot find module './scripts/danger-dts'
VMError: Cannot find module './scripts/danger-dts'
    at _require (/home/travis/build/danger/danger-js/node_modules/vm2/lib/sandbox.js:234:25)
    at Object.<anonymous> (/home/travis/build/danger/danger-js/dangerfile.ts:75:20)
    at NodeVM.run (/home/travis/build/danger/danger-js/node_modules/vm2/lib/main.js:424:27)
    at Object.<anonymous> (/home/travis/build/danger/danger-js/distribution/runner/DangerfileRunner.js:139:24)
    at step (/home/travis/build/danger/danger-js/distribution/runner/DangerfileRunner.js:40:23)
    at Object.next (/home/travis/build/danger/danger-js/distribution/runner/DangerfileRunner.js:21:53)
    at /home/travis/build/danger/danger-js/distribution/runner/DangerfileRunner.js:15:71
    at Promise (<anonymous>)
    at __awaiter (/home/travis/build/danger/danger-js/distribution/runner/DangerfileRunner.js:11:12)
    at Object.runDangerfileEnvironment (/home/travis/build/danger/danger-js/distribution/runner/DangerfileRunner.js:127:12)

Dangerfile

----------------------------^

Generated by 🚫 dangerJS

[orta]

Interesting, the tests pass, but the real life example fails - I bet this is due to jest and jest's typescript support.

[orta]

Fixed in #378