tsconfig: Target ES2020 instead of ES2017 #353
Description
This matches what we use in the module template: https://github.com/MetaMask/metamask-module-template/blob/085b701d9084b45179caef9db1c0b60afa659a78/tsconfig.json#L13
{{ message }}
This matches what we use in the module template: https://github.com/MetaMask/metamask-module-template/blob/085b701d9084b45179caef9db1c0b60afa659a78/tsconfig.json#L13