Stable null safety release of protobuf (#473)

diff --git a/protobuf/CHANGELOG.md b/protobuf/CHANGELOG.md
index 3254ed3..ffb9888 100644
--- a/protobuf/CHANGELOG.md
+++ b/protobuf/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 2.0.0
+
+* Stable null safety release.
+
 ## 2.0.0-nullsafety.1
 
 * Protobuf messages can now be sent between isolates.
diff --git a/protobuf/pubspec.yaml b/protobuf/pubspec.yaml
index 2528177..74c58fa 100644
--- a/protobuf/pubspec.yaml
+++ b/protobuf/pubspec.yaml
@@ -1,5 +1,5 @@
 name: protobuf
-version: 2.0.0-nullsafety.1
+version: 2.0.0
 description: >-
   Runtime library for protocol buffers support.
   Use https://pub.dev/packages/protoc_plugin to generate dart code for your '.proto' files.
@@ -9,11 +9,11 @@
   sdk: '>=2.12.0-0 <3.0.0'
 
 dependencies:
-  fixnum: ^1.0.0-nullsafety.0
+  fixnum: ^1.0.0
 
 dev_dependencies:
-  test: ^1.16.0-nullsafety.9
-  benchmark_harness: ^2.0.0-nullsafety.0
-  js: ^0.6.3-nullsafety.3
-  pedantic: ^1.10.0-nullsafety.3
-  collection: ^1.15.0-nullsafety.5
+  test: ^1.16.0
+  benchmark_harness: ^2.0.0
+  js: ^0.6.3
+  pedantic: ^1.10.0
+  collection: ^1.15.0