Resolve "Fix missing exported classes"

Closes #8 (closed)

lib/flutter_toolbox.dart

@@ -16,7 +16,13 @@ export 'widgets/styled_container.dart' show StyledContainer;
 // dependencies
 
 export 'package:easy_localization/easy_localization.dart'
-    show EasyLocalization, BuildContextEasyLocalizationExtension, TextTranslateExtension, tr;
+    show
+        DateFormat,
+        EasyLocalization,
+        BuildContextEasyLocalizationExtension,
+        StringTranslateExtension,
+        TextTranslateExtension,
+        tr;
 
 export 'package:equatable/equatable.dart' show Equatable;