Update pubspec.yaml to 0.4.2 (#1059)

pkgs/cronet_http/pubspec.yaml

diff --git a/pkgs/cronet_http/pubspec.yaml b/pkgs/cronet_http/pubspec.yaml
index 7858392..b7c417d 100644
--- a/pkgs/cronet_http/pubspec.yaml
+++ b/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: 0.4.3-wip
+version: 0.4.2
 repository: https://github.com/dart-lang/http/tree/master/pkgs/cronet_http
 
 environment: