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/navigation/util/indexedDB.tsx

@@ -88,7 +88,7 @@ export const readBookmarksFromDB: () => Promise<Map<string, Bookmark>> = () => {
   });
 };
 
-export const removeBookmark: (uri: string) => Promise<void> = uri => {
+export const removeBookmark: (uri: string) => Promise<void> = (uri) => {
   return new Promise<void>((resolve, reject) => {
     openNavigationPluginDB()
       .then((db: IDBDatabase) => {