Bump version to 7.1.3

CHANGELOG

+v7.1.3
+  - Use username instead of full name for identifying users (!204)
+
 v7.1.2
   - Add missing GitlabLogger#error method (!200)
 

lib/gitlab_shell.rb

@@ -196,8 +196,14 @@ class GitlabShell # rubocop:disable Metrics/ClassLength
     end
   end
 
+  def username_from_discover
+    return nil unless user && user['username']
+
+    "@#{user['username']}"
+  end
+
   def username
-    @username ||= user && user['username'] || 'Anonymous'
+    @username ||= username_from_discover || 'Anonymous'
   end
 
   # User identifier to be used in log messages.

spec/gitlab_shell_spec.rb

@@ -31,7 +31,7 @@ describe GitlabShell do
 
   let(:api) do
     double(GitlabNet).tap do |api|
-      api.stub(discover: { 'name' => 'John Doe' })
+      api.stub(discover: { 'name' => 'John Doe', 'username' => 'testuser' })
       api.stub(check_access: GitAccessStatus.new(
                 true,
                 'ok',