Bump: 0.3.0-next -> 0.4.0

[fisuda]

Proposed changes

This PR bumps node-red-contrib-letsfiware-NGSI version from 0.3.0-next to 0.4.0.

Types of changes

What types of changes does your code introduce to the project: Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Update only documentation, not any source code.

Checklist

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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 CLA
• I have updated the change log (CHANGELOG.md)
• 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

N/A

[coveralls]

Coverage: 100.0%. Remained the same when pulling c2db263 on fisuda:release/0.4.0 into 9c6fe5f on lets-fiware:main.