Migrate to null safety.

jmsgomes · jmsgomes · commit 1f477f453b5c · 2022-01-07T12:05:57.000-08:00
Fixes #4.
diff --git a/pubspec.yaml b/pubspec.yaml
@@ -8,4 +8,4 @@ homepage: https://github.com/adaptant-labs/lipsum-dart
 environment:
   sdk: '>=1.24.3 <3.0.0'
 dev_dependencies:
-  test: any
+  test: ^1.20.1
