Extra domains for IBM

Hi, 

I noticed that you're adding all domains and sub-domains for a given employer such as IBM (linux.vnet.ibm.com  or ibm.com). 

Thus, I added another five for ibm that were found by CVSAnalY ( https://github.com/MetricsGrimoire/CVSAnalY ). I guess those should be linked to IBM :).

au1.ibm.com
ca.ibm.com
cn.ibm.com
il.ibm.com
us.ibm.com

The other way around is just to remove linux.vnet.ibm.com and only leave ibm.com.