Update Build Tag

README.md

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 <img src="https://img.shields.io/github/last-commit/ayushsharma82/WebSerial.svg?style=for-the-badge" />
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-<img src="https://img.shields.io/github/workflow/status/ayushsharma82/WebSerial/Arduino%20Library%20CI/master?style=for-the-badge" />
+<img src="https://img.shields.io/github/actions/workflow/status/ayushsharma82/WebSerial/ci.yml?branch=master&style=for-the-badge" />
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 <img src="https://img.shields.io/github/license/ayushsharma82/WebSerial.svg?style=for-the-badge" />
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