make a new release and pull request of PKP's plugin gallery

[stutzmann72]

Description:

• the plugin must be newly released
• plugin must be added to PKP's plugin-gallery for testing

Acceptance:

• plugin is released
• plugin added to PKP's plugin-gallery

[stutzmann72]

Plugin-Gallery: https://github.com/pkp/plugin-gallery/

pull request: pkp/plugin-gallery#457