[DI] Fix missing new line after private alias

Author: ogizanagi

Dumper/YamlDumper.php

@@ -165,7 +165,7 @@ private function addServiceAlias($alias, $id)
             return sprintf("    %s: '@%s'\n", $alias, $id);
         }
 
-        return sprintf("    %s:\n        alias: %s\n        public: false", $alias, $id);
+        return sprintf("    %s:\n        alias: %s\n        public: false\n", $alias, $id);
     }
 
     /**

Tests/Fixtures/yaml/services6.yml

@@ -23,6 +23,8 @@ services:
     another_alias_for_foo:
         alias: foo
         public: false
+    another_third_alias_for_foo:
+        alias: foo
     decorator_service:
         decorates: decorated
     decorator_service_with_name: