Closes # .

Changes proposed in this pull request:

-
-
-

Pull request checklist:

- [ ] branch is rebased on `master` \*
- [ ] proper commit messages \*
- [ ] proper coding style \*
- [ ] code is properly tested
- [ ] tests are passing
- [ ] [document API changes](https://github.com/marienfressinaud/lessy/tree/master/docs/api) (optional)
- [ ] [document migration notes](https://github.com/marienfressinaud/lessy/blob/master/CHANGELOG.md) (optional)
- [ ] reviewer assigned (@marienfressinaud)

\* [Additional information in the documentation](https://github.com/marienfressinaud/lessy/tree/master/docs/pull_request.md).

Closes #

Changes proposed in this pull request:

-
-
-

Pull request checklist:

- [ ] branch is rebased on `master` \*
- [ ] proper commit messages \*
- [ ] proper coding style \*
- [ ] code is properly tested
- [ ] [document API changes](https://github.com/marienfressinaud/lessy/tree/master/docs/api) (optional)
- [ ] [document migration notes](https://github.com/marienfressinaud/lessy/blob/master/CHANGELOG.md) (optional)
- [ ] reviewer assigned (@marienfressinaud)

\* [Additional information in the documentation](https://github.com/marienfressinaud/lessy/tree/master/docs/pull_request.md).

Improve a bit the PR template
doc: Improve a bit the PR template
