Use chainId instead of networkName in the api urls

[PeterTheOne]

Please change https://metadata.ens.domains/{networkName}/{contractAddress(0x[a-fA-F0-9]{40})}/{tokenId} into https://metadata.ens.domains/{chainId}/{contractAddress(0x[a-fA-F0-9]{40})}/{tokenId}. ChainIds are universal and stable, networkName are arbitrary. Sometimes ethereum is named mainnet or eth, sometimes network names change like xDai Chain into Gnosis Chain. So please use chainIds, see https://chainlist.org/ for a list of them.

Alternatively you could replace the networksName and contractAddress with a CAPI-10 address, that contains the chainId and the address in one string.