chore(readme): fix readme import

[luke-h1]

This PR:

• Fixes the code example which seems to use named exports. It seems that the package currently just has a default export and trying to import Balancer as a named export results in the following problem:

Module '"react-wrap-balancer"' has no exported member 'Balancer'. Did you mean to use 'import Balancer from "react-wrap-balancer"' instead?ts(2614)

Notes:

• Hope this PR is ok to make, not sure if named exports are planned to be released soon!

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Name	Status	Preview	Updated
react-wrap-balancer	✅ Ready (Inspect)	Visit Preview	Dec 22, 2022 at 7:26PM (UTC)

[shuding]

Thank you, nice catch!