Prepare package:cronet_http 1.2 for release (#1157)

Author: brianquinlan

pkgs/cronet_http/CHANGELOG.md

@@ -1,8 +1,10 @@
-## 1.2.0-wip
+## 1.2.0
 
 * Support the Cronet embedding dependency with `--dart-define=cronetHttpNoPlay=true`.
 * Fix a bug in the documentation where `isOwned` is used rather than
   `closeEngine`.
+* Upgrade `package:jni` to 0.7.3 to fix a SIGSEGV caused by a null
+  pointer dereference.
 
 ## 1.1.1
 

pkgs/cronet_http/pubspec.yaml

@@ -1,5 +1,5 @@
 name: cronet_http
-version: 1.2.0-wip
+version: 1.2.0
 description: >-
   An Android Flutter plugin that provides access to the Cronet HTTP client.
 repository: https://github.com/dart-lang/http/tree/master/pkgs/cronet_http