update vm_service to allow vm_service:11.0.0 (#438)

CHANGELOG.md

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 660e8a4..cc1f659 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
-## 1.6.3-dev
+## 1.6.3
 
 - Require Dart 2.18
+- Update `package:vm_service` constraints to '>=9.4.0 <12.0.0'.
 
 ## 1.6.2
 

pubspec.yaml

diff --git a/pubspec.yaml b/pubspec.yaml
index 669466c..1411ae8 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: coverage
-version: 1.6.3-dev
+version: 1.6.3
 description: Coverage data manipulation and formatting
 repository: https://github.com/dart-lang/coverage
 
@@ -13,7 +13,7 @@
   path: ^1.8.0
   source_maps: ^0.10.10
   stack_trace: ^1.10.0
-  vm_service: '>=9.4.0 <11.0.0'
+  vm_service: '>=9.4.0 <12.0.0'
 
 dev_dependencies:
   benchmark_harness: ^2.2.0