Prepare protobuf 1.1.1 (#468)

diff --git a/protobuf/CHANGELOG.md b/protobuf/CHANGELOG.md
index 9caa37d..a1a07ee 100644
--- a/protobuf/CHANGELOG.md
+++ b/protobuf/CHANGELOG.md
@@ -1,3 +1,9 @@
+## 1.1.1
+
+* Fix decoding of `oneof` fields from proto3 json. The 'whichFoo' state would 
+  not be set.
+* Fix the return type of `copyWith`.
+
 ## 1.1.0
 
 * Require at least Dart SDK 2.7.0 to enable usage of extension methods.
diff --git a/protobuf/pubspec.yaml b/protobuf/pubspec.yaml
index db61c64..6036e3f 100644
--- a/protobuf/pubspec.yaml
+++ b/protobuf/pubspec.yaml
@@ -1,5 +1,5 @@
 name: protobuf
-version: 1.1.0
+version: 1.1.1
 description: >-
   Runtime library for protocol buffers support.
   Use https://pub.dev/packages/protoc_plugin to generate dart code for your '.proto' files.