Copyright updated.

src/event/modules/ngx_rtsig_module.c

diff --git a/src/event/modules/ngx_rtsig_module.c b/src/event/modules/ngx_rtsig_module.c
index 4b01100..2f0f997 100644
--- a/src/event/modules/ngx_rtsig_module.c
+++ b/src/event/modules/ngx_rtsig_module.c
@@ -1,6 +1,7 @@
 
 /*
  * Copyright (C) Igor Sysoev
+ * Copyright (C) Nginx, Inc.
  */