Add note about aurblup to "UPGRADING".

Signed-off-by: Lukas Fleischer <archlinux@cryptocrack.de>

UPGRADING

@@ -61,6 +61,24 @@ for pkg in *; do
 done
 ----
 
+4. (optional): 1.8.0 includes a helper utility called "aurblup" that can be
+used to prevent users from uploading source packages with names identical to
+packages in predefined binary repos, e.g. the official repositories of your
+distribution. In order to build and install aurblup, enter the following
+commands:
+
+	cd scripts/aurblup/
+	make config.h
+	$EDITOR config.h
+	make install  # as root
+
+Add something like "0 * * * * /usr/local/bin/aurblup" to root's crontab to make
+aurblup update the package blacklist every hour.
+
+NOTE: You can run aurblup as non-privileged user as well. Make sure that the
+user has read-write access to "/var/lib/aurblup/" (or whatever you defined with
+"ALPM_DBPATH") tho.
+
 From 1.6.0 to 1.7.0
 -------------------
 ALTER TABLE Users ADD Salt CHAR(32) NOT NULL DEFAULT '';