fix: image attachments in jira issue aren't copied over to the PR description

[yohanb]

When creating a pull request from an issue that contains an image attachment (or any other attachment for that matter), it's not copied over.

Steps to reproduce

• Create a jira issue and copy/paste an image in the description
• fotingo review the issue to create the pull request
• Notice that the pull request description contains a broken link for the image