Fixed publish event e2e test

[santosh-chamoli]

Description

Added specversion and datacontenttype in event payload published by test. specversion field is mandatory now and its absence leads to 400 error code while publishing events from test.
This change fixes the e2e test failure reported in #80

Related Issue

Fixes #80

Motivation and Context

How Has This Been Tested?

npm run e2e is green

Screenshots (if appropriate):

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] I have signed the Adobe Open Source CLA.
• [ 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.
• I have added tests to cover my changes.
• [x ] All new and existing tests passed.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[sandeep-paliwal]

@santosh-chamoli can we add more detail in PR description so that its easy to understand the issue and what got fixed.

[santosh-chamoli]

@santosh-chamoli can we add more detail in PR description so that its easy to understand the issue and what got fixed.

Thanks for the feedback, updated PR description.