Prepare for stable v3 release (#452)

Author: kevmoo

.github/workflows/dart.yml

@@ -10,13 +10,13 @@ on:
     - cron: "0 0 * * 0"
 
 jobs:
-  # Check code formating and static analysis on a single OS (linux)
+  # Check code formatting and static analysis on a single OS (linux)
   # against Dart dev.
   analyze:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        sdk: [dev]
+        sdk: [dev, beta]
     steps:
       - uses: actions/checkout@v2
       - uses: cedx/setup-dart@v2
@@ -50,7 +50,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        sdk: [dev]
+        sdk: [dev, beta]
         platform: [vm, chrome]
         exclude:
           # We only run Chrome tests on Linux. No need to run them

CHANGELOG.md

@@ -1,6 +1,7 @@
-## 3.0.0-nullsafety.0
+## 3.0.0
 
 * Migrate library and tests to null safety.
+* Require Dart 2.12 or greater.
 
 ## 2.9.0
 

pubspec.yaml

@@ -1,29 +1,29 @@
 name: grpc
 description: Dart implementation of gRPC, a high performance, open-source universal RPC framework.
 
-version: 3.0.0-nullsafety.0
+version: 3.0.0
 
 repository: https://github.com/grpc/grpc-dart
 
 environment:
   sdk: '>=2.12.0-0 <3.0.0'
 
 dependencies:
-  archive: ^3.0.0-nullsafety
-  async: ^2.5.0-nullsafety.0
-  crypto: ^3.0.0-nullsafety
-  fixnum: ^1.0.0-nullsafety
-  googleapis_auth: ^1.0.0-nullsafety.0
-  meta: ^1.3.0-nullsafety.0
-  http: ^0.13.0-nullsafety.0
-  http2: ^2.0.0-nullsafety
-  protobuf: ^2.0.0-nullsafety.1
+  archive: ^3.0.0
+  async: ^2.5.0
+  crypto: ^3.0.0
+  fixnum: ^1.0.0
+  googleapis_auth: ^1.0.0
+  meta: ^1.3.0
+  http: ^0.13.0
+  http2: ^2.0.0
+  protobuf: ^2.0.0
 
 dev_dependencies:
   build_runner: ^1.11.0
   build_test: ^1.3.4
   mockito: ^5.0.0-nullsafety.6
-  path: ^1.8.0-nullsafety.3
-  test: ^1.16.0-nullsafety.16
-  stream_channel: ^2.1.0-nullsafety.3
-  stream_transform: ^2.0.0-nullsafety
+  path: ^1.8.0
+  test: ^1.16.0
+  stream_channel: ^2.1.0
+  stream_transform: ^2.0.0