Update README.md

Author: michael-spengler

README.md

@@ -19,7 +19,7 @@ import Web3 from 'https://deno.land/x/web3/mod.ts'
 
 const providerURL = Deno.args[0]
 
-const web3 = new Web3.providers.HttpProvider(providerURL))
+const web3 = new Web3(new Web3.providers.HttpProvider(providerURL))
 
 const balance = await web3.eth.getBalance("0x7a915e362353d72570dcf90aa5baa1c5b341c7aa")