upgraded ngx_redis2 to 0.15.

Author: agentzh

util/mirror-tarballs

@@ -598,7 +598,7 @@ mv FRiCKLE-ngx_coolkit-* ngx_coolkit-$ver || exit 1
 
 #################################
 
-ver=0.15rc1
+ver=0.15
 $root/util/get-tarball "https://github.com/openresty/redis2-nginx-module/tarball/v$ver" -O redis2-nginx-module-$ver.tar.gz || exit 1
 tar -xzf redis2-nginx-module-$ver.tar.gz || exit 1
 mv openresty-redis2-nginx-module-* redis2-nginx-module-$ver || exit 1