Bump Prettier to 1.13.4 on xplat

Summary:
@public

Bump Prettier to use version 1.13.4
All code changes are caused by running Prettier and should only affect files that have an `format` header.
All other changes caused by yarn.

Reviewed By: ryanmce

Differential Revision: D8251255

fbshipit-source-id: 0b4445c35f1269d72730f2000002a27c1bc35914

javascript/tests/run-bench.js

@@ -61,7 +61,7 @@ for (let [name, results] of testResults) {
 
   for (let [type, result] of results) {
     console.log(
-      `  - ${type}: ${result}ms (${Math.round(result / min * 10000) / 100}%)`,
+      `  - ${type}: ${result}ms (${Math.round((result / min) * 10000) / 100}%)`,
     );
   }
 }