Fixed a bug that could cause email notification conversion to fail if the "admin email" doesn't have an email address.
Security fix for #379. Filter output field values from submissions.

There is a possible security issue when viewing submissions in the
 admin area. If another admin user edits a submission, they can
edit the field values with malicious Javascript etc.
Fixing Cross-Site Scripting vulnerability when using the ninja_forms_field shortcode to display data to the user.
Merge pull request #380 from carlowens/develop

Security fix for #379. Filter output field values from submissions.
Updating to version 2.8.9.
Merge branch 'release/v2.8.9' into develop
Merge branch 'develop' into feature/ui-simplification