Avoid magic prefix parsing

lib/models/jenkins/audit.rb

@@ -11,7 +11,7 @@ module Jenkins
     def to_a
       return if @folders.nil?
 
-      ["--folders", @folders]
+      [["--folders", @folders]]
     end
   end
 end

lib/models/jenkins/dry_run.rb

@@ -11,7 +11,7 @@ module Jenkins
     def to_a
       return if @source_url.nil?
 
-      ["--source-url", @source_url]
+      [["--source-url", @source_url]]
     end
   end
 end

lib/models/jenkins/migrate.rb

@@ -11,8 +11,8 @@ module Jenkins
 
     def to_a
       args = []
-      args.concat(["--source-url", @source_url]) unless @source_url.nil?
-      args.concat(["--target-url", @target_url]) unless @target_url.nil?
+      args.push(["--source-url", @source_url]) unless @source_url.nil?
+      args.push(["--target-url", @target_url]) unless @target_url.nil?
 
       return args unless args.empty?
     end