Add trace collection info as an option

[Parth Patel]

It would be nice to get info around the trace that was collected like which pid was used and the time the trace was pulled:

# ts = 1572757654.468000
# collected_at = 1572757654.510204
# pid = 26089

[Parth Patel]

Added this in a PR here #89

[Adam]

Added in 5812072