prettier 2

Summary:
Quick notes:

- This looks worse than it is. It adds mandatory parentheses to single argument lambdas. Lots of outrage on Twitter about it, personally I'm {emoji:1f937_200d_2642} about it.
- Space before function, e.g. `a = function ()` is now enforced. I like this because both were fine before.
- I added `eslint-config-prettier` to the config because otherwise a ton of rules conflict with eslint itself.

Close https://github.com/facebook/flipper/pull/915

Reviewed By: jknoxville

Differential Revision: D20594929

fbshipit-source-id: ca1c65376b90e009550dd6d1f4e0831d32cbff03

desktop/app/src/chrome/DoctorBar.tsx

@@ -59,7 +59,7 @@ class DoctorBar extends Component<Props, State> {
   static getDerivedStateFromProps(props: Props, state: State): State | null {
     const failedCategories = Object.values(
       props.healthcheckReport.categories,
-    ).filter(cat => hasProblems(cat.result));
+    ).filter((cat) => hasProblems(cat.result));
     if (failedCategories.length == 1) {
       const failedCat = failedCategories[0];
       if (failedCat.key === 'ios' || failedCat.key === 'android') {
@@ -131,7 +131,7 @@ class DoctorBar extends Component<Props, State> {
     );
   }
   setVisible(visible: boolean) {
-    this.setState(prevState => {
+    this.setState((prevState) => {
       return {
         ...prevState,
         visible,