bump prettier to 1.18.2 (denoland/deno_std#592)

Original: 06958a4ada

util/async.ts

@@ -20,11 +20,9 @@ export interface Deferred<T> extends Promise<T> {
  */
 export function deferred<T>(): Deferred<T> {
   let methods;
-  const promise = new Promise<T>(
-    (resolve, reject): void => {
-      methods = { resolve, reject };
-    }
-  );
+  const promise = new Promise<T>((resolve, reject): void => {
+    methods = { resolve, reject };
+  });
   return Object.assign(promise, methods)! as Deferred<T>;
 }
 
@@ -111,10 +109,9 @@ export async function collectUint8Arrays(
 
 // Delays the given milliseconds and resolves.
 export function delay(ms: number): Promise<void> {
-  return new Promise(
-    (res): number =>
-      setTimeout((): void => {
-        res();
-      }, ms)
+  return new Promise((res): number =>
+    setTimeout((): void => {
+      res();
+    }, ms)
   );
 }