Show What's New dialog in app via Help -> Go to release notes

ts/test-both/state/ducks/globalModals_test.ts

@@ -24,4 +24,19 @@ describe('both/state/ducks/globalModals', () => {
       assert.isFalse(nextNextState.isProfileEditorVisible);
     });
   });
+
+  describe('showWhatsNewModal/hideWhatsNewModal', () => {
+    const { showWhatsNewModal, hideWhatsNewModal } = actions;
+
+    it('toggles isWhatsNewVisible to true', () => {
+      const state = getEmptyState();
+      const nextState = reducer(state, showWhatsNewModal());
+
+      assert.isTrue(nextState.isWhatsNewVisible);
+
+      const nextNextState = reducer(nextState, hideWhatsNewModal());
+
+      assert.isFalse(nextNextState.isWhatsNewVisible);
+    });
+  });
 });