chore: update pubspec

pubspec.yaml

@@ -1,8 +1,5 @@
 name: spritverbrauch
 description: "A simple app to keep track of how much fuel you're using on average."
-# The following line prevents the package from being accidentally published to
-# pub.dev using `flutter pub publish`. This is preferred for private packages.
-publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 
 # The following defines the version and build number for your application.
 # A version number is three numbers separated by dots, like 1.2.43