Added link to mining calculator

Author: dondreytaylor

public/views/pages/section-miningpools.html

@@ -48,6 +48,7 @@ <h3>Mining <span>Pools</span></h3>
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             <p><small>You can also track the hashrate and status of all public <a href="https://miningpoolstats.stream/bithereum" target="_blank">Bithereum pools on MiningPoolStats</a>.</small></p>
+            <p><small>you can track eth mining profitability via the <a href="https://4miners.pro/cryptocurrencies/item/323-Bithereum-BTH-Equihash_144-calculator" target="_blank">BTH mining calcaultor from 4Miners</a>.</small></p>
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