Enable Marketplace Plugin

Why these changes are being made:
This is required to be able to install premium license keys. During the
testing in Dev1, it quickly became clear that the Marketplace plugin
must be active to manage the premium license keys.

How this is implemented:
* Add the Marketplace plugin to the [Plugins] section of the
config.ini.php file.

Author: cabutlermit

files/config.ini.php

@@ -32,6 +32,7 @@
 ; maximum number of rows for sub-tables of the Events tables (eg. for the subtables Categories>Actions or Categories>Names).
 datatable_archiving_maximum_rows_subtable_events = 100
 
+
 [mail]
 
 [Plugins]
@@ -87,6 +88,7 @@
 Plugins[] = "Resolution"
 Plugins[] = "DevicePlugins"
 Plugins[] = "Heartbeat"
+Plugins[] = "Marketplace"
 Plugins[] = "Intl"
 Plugins[] = "Tour"
 Plugins[] = "PagePerformance"