[Plugin is not yet installed rvMaxMindGeoIP2Maintenance]

Hi,

Just upgraded from revive 5.2.1 to 5.3.0, and the installation succeeded, but there were some problems with the revive plugin :

```

Finished file-check for plugins
#! reviveMaxMindGeoIP2(): Problems found with components in group rvMaxMindGeoIP2.  The reviveMaxMindGeoIP2 plugin has been disabled.  Go to the Configuration->Plugins page for details
#! reviveMaxMindGeoIP2(): Plugin is not yet installed rvMaxMindGeoIP2
#! reviveMaxMindGeoIP2(): Plugin not installed
#! reviveMaxMindGeoIP2(): Problems found with components in group rvMaxMindGeoIP2Maintenance.  The reviveMaxMindGeoIP2 plugin has been disabled.  Go to the Configuration->Plugins page for details
#! reviveMaxMindGeoIP2(): Plugin is not yet installed rvMaxMindGeoIP2Maintenance
#! reviveMaxMindGeoIP2(): Plugin not installed

```

I connected as admin, and enabled the MaxMind GeoIP2 Plugin, and it seems to work.

But when I click on "diagnose", the current error is displayed:

```

Plugin is not yet installed rvMaxMindGeoIP2Maintenance
Plugin not installed

```

Googling rvMaxMindGeoIP2Maintenance yelds no results at all, and I'm wondering what's all this about.

Any clues ?

thanks in advance !