Add the version each feature was introduced and remove note

doc/workflow/importing/import_projects_from_github.md

@@ -5,11 +5,14 @@ enable the [GitHub integration][gh-import] in your GitLab instance._
 
 At its current state, GitHub importer can import:
 
-- the repository description
-- the git repository data
-- the issues
-- the pull requests
-- the wiki pages
+- the repository description (introduced in GitLab 7.7)
+- the git repository data (introduced in GitLab 7.7)
+- the issues (introduced in GitLab 7.7)
+- the pull requests (introduced in GitLab 8.4)
+- the wiki pages (introduced in GitLab 8.4)
+
+It is not yet possible to import your labels and milestones. We are working on
+improving this in the near future.
 
 The importer page is visible when you [create a new project][new-project].
 Click on the **GitHub** link and you will be redirected to GitHub for
@@ -35,12 +38,6 @@ The importer will create any new namespaces if they don't exist or in the
 case the namespace is taken, the project will be imported on the user's
 namespace.
 
-### Note
-
-When you import your projects from GitHub, it is not possible to keep your
-labels, milestones, and cross-repository pull requests. We are working on
-improving this in the near future.
-
 [gh-import]: ../../integration/github.md "GitHub integration"
 [ee-gh]: http://doc.gitlab.com/ee/integration/github.html "GitHub integration for GitLab EE"
 [new-project]: ../../gitlab-basics/create-project.md "How to create a new project in GitLab"