Support latest pkg:http, prepare for release

CHANGELOG.md

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 68d89da..b0767a2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 1.2.3
+
+* Support the latest `package:http` release.
+
 # 1.2.2
 
 * Allow the stable 2.0 SDK.

pubspec.yaml

diff --git a/pubspec.yaml b/pubspec.yaml
index 915622b..6e9d47f 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,16 +1,19 @@
 name: oauth2
-version: 1.2.2
+version: 1.2.3
 author: Dart Team <misc@dartlang.org>
 homepage: https://github.com/dart-lang/oauth2
-description: >
+description: >-
   A client library for authenticating with a remote service via OAuth2 on
   behalf of a user, and making authorized HTTP requests with the user's
   OAuth2 credentials.
+
 environment:
-  sdk: '>=2.0.0-dev.17.0 <3.0.0'
+  sdk: '>=2.0.0 <3.0.0'
+
 dependencies:
-  http: '>=0.11.0 <0.12.0'
+  http: '>=0.11.0 <0.13.0'
   http_parser: '>=1.0.0 <4.0.0'
+
 dev_dependencies:
   pedantic: ^1.2.0
   test: ^1.0.0