Use official JSON schema for YML configuration file

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Hello @ktomk,

I found a link to this tool in your reply to a Atlassian Community question. I just wanted to let you know that there's now an official JSON schema for Pipelines YML configuration file format available at the following URL: https://api.bitbucket.org/schemas/pipelines-configuration

I imagine it might be easier for you to bundle it into your tool cause you won't need to worry about keeping the schema up to date with the new Pipelines features.

Let me know if you have any questions.

Cheers,
Daniil