update supported SDK range for 2.11

CHANGELOG.md

diff --git a/CHANGELOG.md b/CHANGELOG.md
index bf487ee..b53a1c8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+#### 4.0.0-nullsafety.2
+
+* Update supported SDK range.
+
 #### 4.0.0-nullsafety.1
 
 * Migrate to null-safety.

pubspec.yaml

diff --git a/pubspec.yaml b/pubspec.yaml
index 538f3ad..bedd57b 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,10 +1,10 @@
 name: process
-version: 4.0.0-nullsafety.1
+version: 4.0.0-nullsafety.2
 description: A pluggable, mockable process invocation abstraction for Dart.
 homepage: https://github.com/google/process.dart
 
 environment:
-  sdk: '>=2.10.0-4.0.dev <2.10.0'
+  sdk: '>=2.10.0-0.0 <2.11.0'
 
 dependencies:
   file: '^6.0.0-nullsafety.1'