Fix spacing in Markdown lists and definitions

[DervexDev]

Closes #9.

This PR makes changelogs generated by this action 100% accurate with Keep a Changelog format.

Before:

...

## [0.2.0] - 2019-09-13

### Added

-   First feature that is gonna make us money.
-   Quite a few bugs, sorry in advance!

### Changed

-   Reworked the login system. You have to provide a password now!

## [0.1.0] - 2019-09-05

### Added

-   Initial release :tada:

[Unreleased]: https://github.com/foo/bar/compare/0.2.0...HEAD

[0.2.0]: https://github.com/foo/bar/compare/0.1.0...0.2.0

[0.1.0]: https://github.com/foo/bar/compare/1625533e04119e8496b14d5e18786f150b4fce4d...0.1.0

After:

...

## [0.2.0] - 2019-09-13

### Added

- First feature that is gonna make us money.
- Quite a few bugs, sorry in advance!

### Changed

- Reworked the login system. You have to provide a password now!

## [0.1.0] - 2019-09-05

### Added

- Initial release :tada:

[unreleased]: https://github.com/foo/bar/compare/0.2.0...HEAD
[0.2.0]: https://github.com/foo/bar/compare/0.1.0...0.2.0
[0.1.0]: https://github.com/foo/bar/compare/1625533e04119e8496b14d5e18786f150b4fce4d...0.1.0

I also formatted the code and made some minor improvements.

I would love this change to be released as soon as possible :)

[thomaseizinger]

One request, otherwise LGTM!

I'd appreciate if the re-formatting also comes with CI checks so we don't mess it up again.

[DervexDev]

I'd appreciate if the re-formatting also comes with CI checks so we don't mess it up again.

Added CI workflow that run tests.

[thomaseizinger]

Awesome, thanks a lot! :)

[DervexDev]

Umm that's weird why does npm test fail? I was able to run tests with no problem on my machine.

[thomaseizinger]

Umm that's weird why does npm test fail? I was able to run tests with no problem on my machine.

I don't know what the default nodejs version is on GitHub. Might be worth using setup-node to be explicit.

[DervexDev]

Done!

I also had to ignore one TS error as it actually doesn't affect anything. Tests now work just fine and I was able to build action with no problems!

[thomaseizinger]

Thank you very much! This is now released.