Add log rotating to flipper-server

Summary:
CHANGELOG: Rotate flipper-server logs

Otherwise, they re going to eat up all space eventually in a one monstrous file

Reviewed By: passy

Differential Revision: D37516868

fbshipit-source-id: 478a61c56ec007e4a3d695f7e6df2a61cb33c33a

desktop/flipper-server/src/index.tsx

@@ -78,7 +78,7 @@ const rootDir = argv.bundler
 const staticDir = path.join(rootDir, 'static');
 
 async function start() {
-  const enhanceLogger = initializeLogger(staticDir);
+  const enhanceLogger = await initializeLogger(staticDir);
 
   let keytar: any = undefined;
   try {