Prepare 0.6.0-dev

[chicco785]

Proposed changes

Prepare 0.6.0-dev

Types of changes

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an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Documentation (improve documentation)
• Continuous Integration (functionality that improve automation or testing)
• Breaking change (fix or feature that would cause existing
  functionality to not work as expected)

Checklist

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creating the PR. If you're unsure about any of them, don't hesitate to
ask. We're here to help! This is simply a reminder of what we are going
to look for before merging your code.

• I have read the CONTRIBUTING doc
• I have signed the Contributor License Agreement
• I have updated the RELEASE NOTES
• I have added tests that prove my fix is effective or that my
  feature works
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in
  downstream modules

Further comments

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by explaining why you chose the solution you did and what alternatives
you considered, etc...

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