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/plugins/fresco/MultipleSelect.tsx

@@ -15,7 +15,7 @@ const Container = styled(Block)({
   marginLeft: '10px',
 });
 
-const List = styled(FlexColumn)<{visibleList: boolean}>(props => ({
+const List = styled(FlexColumn)<{visibleList: boolean}>((props) => ({
   display: props.visibleList ? 'flex' : 'none',
   position: 'absolute',
   top: '32px',