Removed git ignored files

README.md

@@ -14,3 +14,8 @@ It expects that the json input is formatted as an object containing an array of
 | freezeTopRow | true | Freezes the first row of the Excel worksheet |
 | autofilter | true | Sets the auto filter on the first row |
 | autowidth | true | Automatically set the column width to fit contents |
+
+## Advanced configuration
+
+Advanced settings can be provided via a top level json key named "config". Below are options that can be set via this config key:
+- key-order