Merge pull request #1406 from pi-hole/update/UA

Update default User Agent to modern browser.

gravity.sh

@@ -187,7 +187,7 @@ gravity_spinup() {
 		saveLocation=${piholeDir}/list.${i}.${domain}.${justDomainsExtension}
 		activeDomains[$i]=${saveLocation}
 
-		agent="Mozilla/10.0"
+		agent="Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2227.0 Safari/537.36"
 
 		# Use a case statement to download lists that need special cURL commands
 		# to complete properly and reset the user agent when required