Update pubspec.yaml (singerdmx#1221)

Author: rodrigo-itao

flutter_quill_extensions/pubspec.yaml

@@ -19,7 +19,7 @@ dependencies:
   video_player: ^2.4.2
   youtube_player_flutter: ^8.1.1
   gallery_saver: ^2.3.2
-  math_keyboard: ^0.1.8
+  math_keyboard: ^0.2.0
   string_validator: ^1.0.0
   universal_html: ^2.2.1
   url_launcher: ^6.1.9