Added dnstwist

Added link to dnstwist under "Network (DNS)".

README.md

@@ -230,6 +230,7 @@ Only main chapters:
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/jedisct1/dnscrypt-proxy"><b>dnscrypt-proxy 2</b></a> - a flexible DNS proxy, with support for encrypted DNS protocols.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/dnsdb/dnsdbq"><b>dnsdbq</b></a> - API client providing access to passive DNS database systems.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/looterz/grimd"><b>grimd</b></a> - fast dns proxy, built to black-hole internet advertisements and malware servers.<br>
+  &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/elceef/dnstwist"><b>dnstwist</b></a> - detect typosquatters, phishing attacks, fraud, and brand impersonation.<br>
 </p>
 
 ##### :black_small_square: Network (HTTP)