add badges in README.md

README.md

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 [![docs](https://img.shields.io/badge/docs-stable-blue.svg)](https://yusuke-takase.github.io/grasp2alm/index.html)
-[![build status]](https://github.com/yusuke-takase/grasp2alm/blob/master/.github/workflows/test.yml/badge.svg?branch=master)
+[![build status]](https://github.com/yusuke-takase/grasp2alm/actions/workflows/test.yml/badge.svg?branch=master)
 
 This package supports the conversion from beam data calculated using [GRASP](https://www.ticra.com/software/grasp/) for CMB experiments to spherical harmonic coefficients ($a_{lm}$) based on the [HEALPix](https://healpix.sourceforge.io/) framework.
 The code is designed based on [Beam](https://github.com/zonca/planck-levelS/tree/master/Beam), which is part of [LevelS](https://github.com/zonca/planck-levelS), the pipleline of the Planck experiment.