📝 Update Block Explorer Link

Signed-off-by: Pascal Marco Caversaccio <pascal.caversaccio@hotmail.ch>

Author: pcaversaccio

README.md

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   - BNB Smart Chain Testnet: [`0x13b0D85CcB8bf860b6b79AF3029fCA081AE9beF2`](https://testnet.bscscan.com/address/0x13b0D85CcB8bf860b6b79AF3029fCA081AE9beF2)
   - Optimism Testnet (Kovan; ⚠️ Deprecated): [`0x13b0D85CcB8bf860b6b79AF3029fCA081AE9beF2`](https://kovan-optimistic.etherscan.io/address/0x13b0D85CcB8bf860b6b79AF3029fCA081AE9beF2)
   - Optimism Testnet (Goerli; ⚠️ Deprecated): [`0x13b0D85CcB8bf860b6b79AF3029fCA081AE9beF2`](https://goerli-optimism.etherscan.io/address/0x13b0D85CcB8bf860b6b79AF3029fCA081AE9beF2)
-  - OP (Optimism) Testnet (Sepolia): [`0x13b0D85CcB8bf860b6b79AF3029fCA081AE9beF2`](0x13b0D85CcB8bf860b6b79AF3029fCA081AE9beF2)
+  - OP (Optimism) Testnet (Sepolia): [`0x13b0D85CcB8bf860b6b79AF3029fCA081AE9beF2`](https://sepolia-optimism.etherscan.io/address/0x13b0D85CcB8bf860b6b79AF3029fCA081AE9beF2)
   - Arbitrum Testnet (Rinkeby; ⚠️ Deprecated): [`0x13b0D85CcB8bf860b6b79AF3029fCA081AE9beF2`](https://testnet.arbiscan.io/address/0x13b0D85CcB8bf860b6b79AF3029fCA081AE9beF2)
   - Arbitrum Testnet (Goerli; ⚠️ Deprecated): [`0x13b0D85CcB8bf860b6b79AF3029fCA081AE9beF2`](https://goerli.arbiscan.io/address/0x13b0D85CcB8bf860b6b79AF3029fCA081AE9beF2)
   - Arbitrum Testnet (Sepolia): [`0x13b0D85CcB8bf860b6b79AF3029fCA081AE9beF2`](https://sepolia.arbiscan.io/address/0x13b0D85CcB8bf860b6b79AF3029fCA081AE9beF2)