Update README.md (base#24)

Co-authored-by: Michael de Hoog <[email protected]>

README.md

@@ -5,7 +5,7 @@ Golang utility for proving and finalizing ETH withdrawals from op-stack chains.
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+[![GitHub commit activity](https://img.shields.io/github/commit-activity/w/base/withdrawer)](https://github.com/base/withdrawer/graphs/commit-activity)
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@@ -16,7 +16,7 @@ Golang utility for proving and finalizing ETH withdrawals from op-stack chains.
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