run markdownlint on CONTRIBUTING.md

Author: o2sh

Diff for: CONTRIBUTING.md

@@ -10,10 +10,10 @@ information to effectively respond to your bug report or contribution.
 * [Contributing via Pull Requests](#contributing-via-pull-requests)
 * [Finding contributions to work on](#finding-contributions-to-work-on)
   * [Adding support for a new language](#adding-support-for-a-new-language)
-  * [Ascii logo](#ascii-logo)
-    * [Adding support for a new package manager](#adding-support-for-a-new-package-manager)
-    * [Adding translation for README.md](#adding-translation-for-readmemd)
-    * [Project-specific notes](#project-specific-notes)
+    * [Ascii logo](#ascii-logo)
+  * [Adding support for a new package manager](#adding-support-for-a-new-package-manager)
+  * [Adding translation for README.md](#adding-translation-for-readmemd)
+  * [Project-specific notes](#project-specific-notes)
 * [Special Thanks](#special-thanks-to)
 
 ## Reporting Bugs / Feature Requests