v0.12.0 🐘

Changes

• Add CONTRIBUTING.md (#57) @curquiza

Breaking changes

• Refactor for SOLID compliance (#43) @ppshobi - Breaking on:

• getAllIndexes returns an array of Indexes instead of an array of an array
• Index class is renamed into Indexes
• api_key that is a parameter of the client constructor is renamed into apiKey

Thanks again to @curquiza and @ppshobi! 🎉