chore: update Cecil plugin version

[ArnaudLigny]

Thanks for contributing the Netlify plugins directory!

Are you adding a plugin or updating one?

• Adding a plugin
• Updating a plugin

Have you completed the following?

• Read and followed the plugin author guidelines.
• Included all required fields in your entry.
• Tested the plugin locally and on Netlify, using the plugin version stated in your entry.

Test plan
Please add a link to a successful public deploy log using the stated version of the plugin. Include any other context reviewers might need for testing.

Successful build with the version 0.3.4 of the plugin: https://app.netlify.com/sites/arnaudligny/deploys/6810d7fcecadce5d27523c01

[netlify]

👷 Deploy request for netlify-plugins pending review.

Visit the deploys page to approve it

Name	Link
🔨 Latest commit	02ae1b9