Fix prettier issue (#866)

Summary:
I think I broke this. Soz.
Pull Request resolved: https://github.com/facebook/flipper/pull/866

Reviewed By: nikoant

Differential Revision: D20279605

Pulled By: passy

fbshipit-source-id: 4e2ed3b1230adae67f3f3a90020b8539ba00086a

scripts/build-release.ts

@@ -111,7 +111,7 @@ async function buildDist(buildFolder: string) {
           output: path.join(__dirname, '..', 'dist'),
         },
         electronDownload: electronDownloadOptions,
-        npmRebuild: false
+        npmRebuild: false,
       },
       projectDir: buildFolder,
       targets,