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/dispatcher/reactNative.tsx

@@ -44,10 +44,10 @@ export default (store: Store) => {
         const devices = store
           .getState()
           .connections.devices.filter(
-            device => device.os === 'Metro' && !device.isArchived,
+            (device) => device.os === 'Metro' && !device.isArchived,
           ) as MetroDevice[];
 
-        devices.forEach(device => device.sendCommand(shortcut.command));
+        devices.forEach((device) => device.sendCommand(shortcut.command));
       }),
   );
 };