✨ Add semver property to the gitmojis

[ilyasmez]

Closes: #429

Description

What?

This PR adds a semver property to each Gitmoji. The semver property can be 'major' for breaking changes, 'minor' for new features, 'patch' for bugfixes/small improvements and null if the commit doesn't affect the version of the package.

Why?

Gitmojis are too granular, and we need a higher level grouping to know what kind of effect does each gitmoji/commit have on the project, which is necessary to be able to automate the package publishing process and so on.
Right now, there are some third-party projects that try to do this grouping on their side, but because there is a big room of interpretation of each emoji, they are not consistent.

Things to keep in mind

• This is my interpretation of the gitmojis, please drop your comments, so we find a common ground.
• The semantic versioning effect is based on the final package, and not the repo itself, so 🚚 for instance has no effect from my point of view, unless it affects the final package, and in that case the developer should use 💥 instead.

Tests

• All tests passed.

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[ilyasmez]

@elliot-nelson @gustavopch @frinyvonnick @vhoyer @carloscuesta
Could you please have a look?

[carloscuesta]

Awesome! Looks good to me, let's just wait for the opinion of other people that participated on the issue before merging this 🚀

[vhoyer]

looks sweet to me; let's just hit the nail on which semver to use which what emoji, but the implementation looks flawless in my opinion :D

[frinyvonnick]

Looks good to me too 🎉

[ilyasmez]

43f1bd0: @vhoyer had some valid arguments regarding ➕ and ➖, I've set them to "patch" as agreed on here.