v0.18.0 — Tronscan labels

Added

• Tron labels from Tronscan. With a free TRONSCAN_API_KEY, Tron addresses
  the curated set lacks get Tronscan's tags in traces, graphs, check and the
  evidence pack: exchange hot and cold wallets become exchange labels, a red
  tag (scam, phishing) makes the address a scam. Labels of kind
  explorer-tag with Tronscan as the source, cached for a week. No key, no
  requests. On an OKX reserve wallet's counterparties this names a 5M TRX
  sender "Okex 1".