fix(request): accept number and boolean as event props

[ouuan]

Description

According to Plausible docs, event props can be strings, numbers or booleans: https://plausible.io/docs/custom-event-goals#using-custom-props

Types of changes

• [x] Bug fix (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 change)

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[ukutaht]

Thanks!

[ouuan]

When will this be released?

[ukutaht]

Released now v0.3.6