message: meta: Issue template + pull request template
diff: +Before submitting a pull request, please take a look at our
  +[Contributing](https://github.com/getsentry/sentry-javascript/blob/master/CONTRIBUTING.md) guidelines and verify:
  -Before submitting a pull request, please verify the following:
  -
  -* [ ] If you've added code that should be tested, please add tests.
  -* [ ] If you've modified the API (e.g. added a new config or public method), update the [docs](https://github.com/getsentry/raven-js/tree/master/docs) and TypeScript [declaration file](/getsentry/raven-js/blob/master/typescript/raven.d.ts).
  -* [ ] Ensure your code lints and the test suite passes (npm test).
  +- [ ] If you've added code that should be tested, please add tests.
  +- [ ] Ensure your code lints and the test suite passes (`yarn lint`) & (`yarn test`).
  