Update README.md (#52)

README.md

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 An Erlang DNS message library that supports most common record types, TSIG authenticated messages, EDNS0 and DNSSEC.
 
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 ## Usage
 
 This library exposes types via `include/dns.hrl`, which in turn includes `include/dns_terms.hrl` and `include/dns_records.hrl`, as well as functions useful for constructing and deconstructing DNS packets with `src/dns.erl`