[e2e] fix flutter driver code snippet in readme and improve formatting of code snippets (#2549)

* [e2e] fix flutter driver code snippet in readme and improve formatting
diff --git a/packages/e2e/CHANGELOG.md b/packages/e2e/CHANGELOG.md
index 442b1db..35d3159 100644
--- a/packages/e2e/CHANGELOG.md
+++ b/packages/e2e/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.2.4+3
+
+* Fixed code snippet in the readme under the "Using Flutter driver to run tests" section.
+
 ## 0.2.4+2
 
 * Make the pedantic dev_dependency explicit.
diff --git a/packages/e2e/README.md b/packages/e2e/README.md
index b3c19ec..ed892ab 100644
--- a/packages/e2e/README.md
+++ b/packages/e2e/README.md
@@ -41,12 +41,15 @@
 
 Put the a file named `<package_name>_e2e_test.dart` in the app' `test_driver` directory:
 
-```
+```dart
+import 'dart:async';
+import 'dart:io';
 import 'package:flutter_driver/flutter_driver.dart';
 
 Future<void> main() async {
   final FlutterDriver driver = await FlutterDriver.connect();
-  await driver.requestData(null, timeout: const Duration(minutes: 1));
+  final String result =
+      await driver.requestData(null, timeout: const Duration(minutes: 1));
   await driver.close();
   exit(result == 'pass' ? 0 : 1);
 }
@@ -73,7 +76,7 @@
 com, example, and myapp with values from your app's package name). You can name
 this test file MainActivityTest.java or another name of your choice.
 
-```
+```java
 package com.example.myapp;
 
 import androidx.test.rule.ActivityTestRule;
diff --git a/packages/e2e/pubspec.yaml b/packages/e2e/pubspec.yaml
index 956f5bf..6873586 100644
--- a/packages/e2e/pubspec.yaml
+++ b/packages/e2e/pubspec.yaml
@@ -1,6 +1,6 @@
 name: e2e
 description: Runs tests that use the flutter_test API as integration tests.
-version: 0.2.4+2
+version: 0.2.4+3
 homepage: https://github.com/flutter/plugins/tree/master/packages/e2e
 
 environment: