Prepare for null safe release (#228)

diff --git a/changelog.md b/CHANGELOG.md
similarity index 98%
rename from changelog.md
rename to CHANGELOG.md
index d2565ba..06538c2 100644
--- a/changelog.md
+++ b/CHANGELOG.md
@@ -1,4 +1,4 @@
-## v 2.1.0-nnbd - June 2020
+## v 2.1.0-nullsafety - June 2020
 
 - Migrate to null safety
 - Improve performance of Matrix4.decompose by reusing objects.
diff --git a/pubspec.yaml b/pubspec.yaml
index c143aa8..f9e9074 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,5 @@
 name: vector_math
-version: 2.1.0-nnbd
-author: John McCutchan <john@johnmccutchan.com>
+version: 2.1.0-nullsafety
 description: A Vector Math library for 2D and 3D applications.
 homepage: https://github.com/google/vector_math.dart