fix IP V6 lookup

[diginc]

Forgot to add the lookup fix from #199 (comment)

Description

The origional IPv6 lookup command in the readme/start script was naive in beliving the IP would have a somewhat static column position. It seems to vary by OS distribution but it always has 'src' in front so this awk command looks for src column +1

Motivation and Context

Better IPv6 user experience

How Has This Been Tested?

• Pipe cmd was tested with the output ipv6 commands.
• Not fully tested until travis runs (editing on web)
• I do not have IPv6 setup properly on my network so I suck at dog fooding the IPv6 feature, help appreciated in testing.

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• I have updated the documentation accordingly.