chore: fix issue tracker on pubspec (#82)

Author: renancaraujo

pubspec.yaml

@@ -2,7 +2,7 @@ name: cli_completion
 description: Completion functionality for Dart Command-Line Interfaces built using CommandRunner. Built by Very Good Ventures.
 version: 0.4.0
 repository: https://github.com/VeryGoodOpenSource/cli_completion
-issue_tracker: https://github.com/VeryGoodOpenSource/pub_updater/issues
+issue_tracker: https://github.com/VeryGoodOpenSource/cli_completion/issues
 topics: [cli, completion, shell, bash, autocomplete]
 screenshots:
   - description: 'This screenshot shows the completion of a dart CLI.'