change version to be non-breaking (#53)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index bc7c9ef..155b6cd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,4 @@
-## 0.11.0-nullsafety
+## 0.10.1-nullsafety
 
 * Migrate to null safety
 
diff --git a/pubspec.yaml b/pubspec.yaml
index 8fc3fb3..d540efb 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: source_maps
-version: 0.11.0-nullsafety
+version: 0.10.1-nullsafety
 
 description: Library to programmatically manipulate source map files.
 homepage: https://github.com/dart-lang/source_maps