Fix obsolete CronetClient() constructor usage (#1042)

Author: brianquinlan

pkgs/cronet_http/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.4.1
+
+* Fix obsolete `CronetClient()` constructor usage.
+
 ## 0.4.0
 
 * Use more efficient operations when copying bytes between Java and Dart.

pkgs/cronet_http/lib/cronet_http.dart

@@ -10,7 +10,7 @@
 /// import 'package:cronet_http/cronet_http.dart';
 ///
 /// void main() async {
-///   var client = CronetClient();
+///   var client = CronetClient.defaultCronetEngine();
 ///   final response = await client.get(
 ///       Uri.https('www.googleapis.com', '/books/v1/volumes', {'q': '{http}'}));
 ///   if (response.statusCode != 200) {

pkgs/cronet_http/lib/src/cronet_client.dart

@@ -235,7 +235,7 @@ jb.UrlRequestCallbackProxy_UrlRequestCallbackInterface _urlRequestCallbacks(
 /// For example:
 /// ```
 /// void main() async {
-///   var client = CronetClient();
+///   var client = CronetClient.defaultCronetEngine();
 ///   final response = await client.get(
 ///       Uri.https('www.googleapis.com', '/books/v1/volumes', {'q': '{http}'}));
 ///   if (response.statusCode != 200) {

pkgs/cronet_http/pubspec.yaml

@@ -1,7 +1,7 @@
 name: cronet_http
 description: >
   An Android Flutter plugin that provides access to the Cronet HTTP client.
-version: 0.4.0
+version: 0.4.1
 repository: https://github.com/dart-lang/http/tree/master/pkgs/cronet_http
 
 environment: