add 3.1.18 message

Author: eugenesvk

messages/3.1.18.md

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+# MarkdownEditing {version} Changelog
+
+Your _MarkdownEditing_ plugin is updated. Enjoy new version. For any type of
+feedback you can use [GitHub issues][issues].
+
+## Bug Fixes
+
+## New Features
+  - add a separate scope `markup.underline.link.protocol` to allow synax highlight e.g. `https` in urls separtely from the rest of the url
+  - add a separate scope `markup.underline.link.www` to allow synax highlight `www.` in urls separtely from the rest of the url
+## Changes
+
+[issues]: https://github.com/SublimeText-Markdown/MarkdownEditing/issues