Fix doctor warning and animation

Summary: Two random tiny changes

Reviewed By: nikoant

Differential Revision: D19309447

fbshipit-source-id: 13a1a66d6b91285a00177ca7a3003fd83b4820f5

src/chrome/mainsidebar/MainSidebar2.tsx

@@ -91,7 +91,7 @@ const SidebarSectionBody = styled('div')<{
   overflow: 'hidden',
   maxHeight: collapsed ? 0 : 2000, // might need increase if too many plugins...
   transition: collapsed
-    ? 'max-height 0.5s ease-out'
+    ? 'max-height 0.3s ease-out'
     : 'max-height 0.5s ease-in',
 }));
 

src/reducers/healthchecks.tsx

@@ -8,7 +8,7 @@
  */
 
 import {Actions} from './';
-import {produce} from 'flipper';
+import {produce} from 'immer';
 import {Healthchecks} from 'flipper-doctor';
 
 export type State = {