makefile for v0.4

Makefile

 dist: CHANGES README LICENSE config ngx_http_uploadprogress_module.c
-	tar czvf ../nginx_uploadprogress_module-0.3.tar.gz  \
+	tar czvf ../nginx_uploadprogress_module-0.4.tar.gz  \
 		 ../nginx_uploadprogress_module/CHANGES \
 		 ../nginx_uploadprogress_module/README \
 		 ../nginx_uploadprogress_module/LICENSE \