Fix typo in README

Close #3

README.md

@@ -136,7 +136,7 @@ import {Test} from "forge-std/Test.sol";
 import {InvariantTest} from "forge-std/InvariantTest.sol";
 import {WETH9} from "../src/WETH9.sol";
 
-contract WETH9Invariants is Test, {
+contract WETH9Invariants is Test {
     WETH9 public weth;
 
     function setUp() public {
@@ -1772,4 +1772,4 @@ Success! Next time Crypto Twitter starts spreading FUD about "unbacked WETH," se
 - [invariant-examples repo](https://github.com/lucas-manuel/invariant-examples)
 - [Invariant Testing in the Foundry Book](https://book.getfoundry.sh/forge/invariant-testing)
 
-_Thanks to [msolomon44](https://twitter.com/msolomon44), [zachobront](https://twitter.com/zachobront), [gakonst](https://twitter.com/gakonst), and [lucasmanuel_eth](https://twitter.com/lucasmanuel_eth) for reviewing earlier drafts of this guide._
+_Thanks to [msolomon44](https://twitter.com/msolomon44), [zachobront](https://twitter.com/zachobront), [gakonst](https://twitter.com/gakonst), and [lucasmanuel_eth](https://twitter.com/lucasmanuel_eth) for reviewing earlier drafts of this guide._