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/plugins.tsx

@@ -100,8 +100,8 @@ function getBundledPlugins(): Array<PluginDefinition> {
   }
 
   return bundledPlugins
-    .filter(plugin => notNull(plugin.out))
-    .map(plugin => ({
+    .filter((plugin) => notNull(plugin.out))
+    .map((plugin) => ({
       ...plugin,
       out: path.join(pluginPath, plugin.out!),
     }));
@@ -164,7 +164,7 @@ export const requirePlugin = (
       }
 
       // set values from package.json as static variables on class
-      Object.keys(pluginDefinition).forEach(key => {
+      Object.keys(pluginDefinition).forEach((key) => {
         if (key === 'name') {
           plugin.id = plugin.id || pluginDefinition.name;
         } else if (key === 'id') {