Update README.md

Author: AninditaBasu

README.md

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-![Static Badge](https://img.shields.io/badge/latest-v1.2.1-green)
+![GitHub License](https://img.shields.io/github/license/AninditaBasu/ledger)  !![GitHub Release](https://img.shields.io/github/v/release/AninditaBasu/ledger?logoColor=green)
+  ![GitHub last commit](https://img.shields.io/github/last-commit/AninditaBasu/ledger) ![GitHub commits since latest release](https://img.shields.io/github/commits-since/AninditaBasu/ledger/latest?logoColor=green)
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 # `ledger` theme for GitHub Pages