remove publish_to: none (#90)

diff --git a/pubspec.yaml b/pubspec.yaml
index d7187da..25a8cb3 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -6,9 +6,6 @@
   abstractions similar to those used in other languages, such as the Closure
   JS Logger and java.util.logging.Logger.
 homepage: https://github.com/dart-lang/logging
-# This package requires the unreleased null safety feature, and cannot be
-# published until that ships.
-publish_to: none
 
 environment:
   sdk: '>=2.12.0-0 <3.0.0'