Merge pull request #3 from awsassets/main

Update README.md

README.md

@@ -30,7 +30,7 @@ You only need a modern browser and that's it.
 - [01 Reading an Address Data](https://kay-is.github.io/web3-from-zero/01-read-address-data.html)
 - [02 Connecting to Smart Contracts](https://kay-is.github.io/web3-from-zero/02-connect-to-contracts.html)
 - [03 Using the Ethereum Name Service](https://kay-is.github.io/web3-from-zero/03-using-ens.html)
-- [04 Ethereum Request for Comment](https://kay-is.github.io/web3-from-zero/04-erc.html)
+- [04 Ethereum Request for Comment](https://kay-is.github.io/web3-from-zero/04-ercs.html)
 - [05 First Example App](https://kay-is.github.io/web3-from-zero/05-example-app.html)
 
 ### Part II: Writing Data to the Blockchain (WIP)