Add tshark capture filter for probe-req - #52
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This keeps the temporary pcap file smaller and easier to parse if you are in an area with many 802.11 devices!
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This change adds a capture filter so that tshark only captures probe requests, ignoring all the other traffic that comes up when a wireless interface is listening in monitor mode.
It uses the following pcap capture filter: "type mgt subtype probe-req"
pcap-filter docs: https://www.tcpdump.org/manpages/pcap-filter.7.html
By using a pcap filter, there is less information in the temporary pcap file to parse. Hopefully this slightly optimizes the code.
PS. This is my first pull request! I hope it is helpful, but my sincerest apologies if this is irrelevant or unhelpful. Thanks again for sharing this project and your awesome documentation!