fix: Coudinary.UploadWidget postMessage issue (fixes #165)

[cliengme]

Fixes postMessage error in console.

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

Resolves: #165

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes (if not applicable, please state why)

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[Baroshem]

Hey buddy,

Thank you so much for the contribution and sorry it took some time (I was away for almost two weeks).

I will work on releasing the fix version this week :)

[Baroshem]

Hey,

Thanks for fixing that! I will merge it and prepare 2.5.0 version with this and some other changes :)