cannot find Ionicons.school_outline

[zk-luke]

Bug info

version:1.1.0
cannot find Ionicons.school_outline.
some other outlined icons are also missing, ios-school-outline、md-school-outline etc.

[josephcrowell]

I pushed out a fork which includes all missing icons including Fontisto fonts and jibiel's fixes for null safety support: https://pub.dev/packages/flutter_font_icons