Changed TGMPA Carbon Fields 'version' attribute to use plugin.json

Author: dmhendricks

app/TGMPA.php

@@ -29,7 +29,7 @@ public function register_required_plugins() {
   			'slug'               => 'carbon-fields', // The plugin slug (typically the folder name).
   			'source'             => 'https://carbonfields.net/zip/latest/', // The plugin source.
   			'required'           => true, // If false, the plugin is only 'recommended' instead of required.
-  			'version'            => '2.1.0', // E.g. 1.0.0. If set, the active plugin must be this version or higher. If the plugin version is higher than the plugin version installed, the user will be notified to update the plugin.
+  			'version'            => self::$config->get( 'dependencies/carbon_fields' ), // E.g. 1.0.0. If set, the active plugin must be this version or higher. If the plugin version is higher than the plugin version installed, the user will be notified to update the plugin.
   			'force_activation'   => true // If true, plugin is activated upon theme activation and cannot be deactivated until theme switch.
   		)