Prepare to publish cupertino 1.2.0 (#1080)

pkgs/cupertino_http/CHANGELOG.md

diff --git a/pkgs/cupertino_http/CHANGELOG.md b/pkgs/cupertino_http/CHANGELOG.md
index 47e25cb..d768f7a 100644
--- a/pkgs/cupertino_http/CHANGELOG.md
+++ b/pkgs/cupertino_http/CHANGELOG.md
@@ -1,4 +1,4 @@
-## 1.2.0-wip
+## 1.2.0
 
 * Add support for setting additional http headers in
   `URLSessionConfiguration`.

pkgs/cupertino_http/pubspec.yaml

diff --git a/pkgs/cupertino_http/pubspec.yaml b/pkgs/cupertino_http/pubspec.yaml
index 81905aa..0a97bdd 100644
--- a/pkgs/cupertino_http/pubspec.yaml
+++ b/pkgs/cupertino_http/pubspec.yaml
@@ -1,5 +1,5 @@
 name: cupertino_http
-version: 1.2.0-wip
+version: 1.2.0
 description: >-
   A macOS/iOS Flutter plugin that provides access to the Foundation URL
   Loading System.