style(subgraph): format code with prettier

Former-commit-id: 469e2a1

Author: cedoor

packages/subgraph/README.md

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 | This library allows you to query the [`Semaphore.sol`](https://github.com/semaphore-protocol/semaphore/blob/main/contracts/Semaphore.sol) contract data (i.e. groups) using the [Semaphore subgraph](https://github.com/semaphore-protocol/subgraph) on Goerli and Arbitrum One. It can be used on Node.js and browsers. |
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 ## 🛠 Install