Remove unused #list_remote_tags

CHANGELOG

+v3.0.0
+  - Remove list-remote-tags command (Robert Schilling)
+
 v2.7.1
   - Add new command to list tags from a remote repo
   - Add the ability to fetch remote repo with or without tags
+
 v2.7.0
   - Add support for ssh AuthorizedKeysCommand query by key

lib/gitlab_projects.rb

@@ -64,7 +64,6 @@ class GitlabProjects
     when 'update-head'; update_head
     when 'push-branches'; push_branches
     when 'delete-remote-branches'; delete_remote_branches
-    when 'list-remote-tags'; list_remote_tags
     when 'gc'; gc
     else
       $logger.warn "Attempt to execute invalid gitlab-projects command #{@command.inspect}."
@@ -75,27 +74,6 @@ class GitlabProjects
   protected
-  def list_remote_tags
-    remote_name = ARGV.shift
-
-    tag_list, exit_code, error = nil
-    cmd = %W(git --git-dir=#{full_path} ls-remote --tags #{remote_name})
-
-    Open3.popen3(*cmd) do |stdin, stdout, stderr, wait_thr|
-      tag_list  = stdout.read
-      error     = stderr.read
-      exit_code = wait_thr.value.exitstatus
-    end
-
-    if exit_code.zero?
-      puts tag_list
-      true
-    else
-      puts error
-      false
-    end
-  end
-
   def push_branches
     remote_name = ARGV.shift