Add fixes for two additional lints

pkg/analysis_server/lib/src/services/correction/fix.dart

Index: pkg/analysis_server/lib/src/services/correction/fix.dart
diff --git a/pkg/analysis_server/lib/src/services/correction/fix.dart b/pkg/analysis_server/lib/src/services/correction/fix.dart
index 3ac901331a647e7e5e98551b274cf90316d4e242..4ad9804107286b5094e6c411964f0153bf02317f 100644
--- a/pkg/analysis_server/lib/src/services/correction/fix.dart
+++ b/pkg/analysis_server/lib/src/services/correction/fix.dart
@@ -158,6 +158,8 @@ class DartFixKind {
       'INVOKE_CONSTRUCTOR_USING_NEW', 50, "Invoke constructor using 'new'");
   static const LINT_ADD_OVERRIDE =
       const FixKind('LINT_ADD_OVERRIDE', 50, "Add '@override' annotation");
+  static const LINT_ADD_REQUIRED =
+      const FixKind('LINT_ADD_REQUIRED', 50, "Add '@required' annotation");
   static const LINT_REMOVE_INTERPOLATION_BRACES = const FixKind(
       'LINT_REMOVE_INTERPOLATION_BRACES',
       50,
@@ -169,6 +171,8 @@ class DartFixKind {
   static const MAKE_FIELD_NOT_FINAL =
       const FixKind('MAKE_FIELD_NOT_FINAL', 50, "Make field '{0}' not final");
   static const REMOVE_AWAIT = const FixKind('REMOVE_AWAIT', 50, "Remove await");
+  static const REMOVE_EMPTY_ELSE =
+      const FixKind('REMOVE_EMPTY_ELSE', 50, "Remove empty else clause");
   static const REMOVE_EMPTY_STATEMENT =
       const FixKind('REMOVE_EMPTY_STATEMENT', 50, "Remove empty statement");
   static const REMOVE_INITIALIZER =