Add ETH Gas Tracker (#427)

Author: wslyvh

README.md

@@ -476,7 +476,7 @@ Many thanks to the ~100 contributors including [@corbpage](https://twitter.com/c
 * [Ethereum-tx-sender](https://github.com/HydroProtocol/ethereum-tx-sender) - A useful library written in Golang to reliably send a transaction — abstracting away some of the tricky low level details such as gas optimization, nonce calculations, synchronization, and retries.
 * [truffle-plugin-verify](https://github.com/rkalis/truffle-plugin-verify) - Seamlessly verify contract source code on Etherscan from the Truffle command line.
 * [Blocknative Gas Platform](https://www.blocknative.com/gas) — Gas estimation for builders, by builders. Gas Platform harnesses Blocknative's real-time mempool data infrastructure to accurately and consistently estimate Ethereum transaction fees. This provides builders and traders with an up-to-the-moment gas fee API.
-* [ETH Gas.watch](https://ethgas.watch/) - A gas price watcher with email notifications on price change
+* [ETH Gas Tracker](https://www.ethgastracker.com/) - Monitor and track Ethereum and L2 gas prices to reduce transaction fees, save money and take control of your blockchain experience
 * [Diverse Eth Calculator](https://ethcalculator.dsolutions.mn/) - Ease unit calculations & utility tools. PWA , so you can install it on your mac/windows/linux or android/iphone
 * [Cookbook](https://cookbook.dev) - A platform aggregating all smart contract libraries
 * [Ethereum Unit Converter](https://neptunemutual.com/web3-tools/ethereum-unit-converter/) - Online tool to convert the different Ethereum denominations (wei, gwei, ether).