add migration for "global" prop on bans

migrations/1.4.2.js

@@ -8,4 +8,5 @@ module.exports = async(db) => {
 			'public': true,
 		},
 	});
+
 };

migrations/1.5.0.js

@@ -0,0 +1,14 @@
+'use strict';
+
+module.exports = async(db) => {
+
+	console.log('Updating all bans with board: null to be global true');
+	await db.collection('bans').updateMany({
+		board: null,
+	}, {
+		'$set': {
+			'global': true,
+		},
+	});
+
+};