upgraded ngx_srcache to 0.13rc4.

Author: agentzh

util/mirror-tarballs

@@ -135,7 +135,7 @@ mv agentzh-memc-nginx-module-* memc-nginx-module-$ver || exit 1
 
 #################################
 
-ver=0.13rc3
+ver=0.13rc4
 $root/util/get-tarball "http://github.com/agentzh/srcache-nginx-module/tarball/v$ver" -O srcache-nginx-module-$ver.tar.gz || exit 1
 tar -xzf srcache-nginx-module-$ver.tar.gz || exit 1
 mv agentzh-srcache-nginx-module-* srcache-nginx-module-$ver || exit 1