Add link to PyPI dartpy package badge

Signed-off-by: Jeongseok (JS) Lee <[email protected]>

README.md

@@ -99,7 +99,7 @@ For more information on DART, please visit the DART documentation: [English](htt
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 | Build                 | [![CI Ubuntu](https://github.com/dartsim/dart/actions/workflows/ci_ubuntu.yml/badge.svg)](https://github.com/dartsim/dart/actions/workflows/ci_ubuntu.yml) [![CI macOS](https://github.com/dartsim/dart/actions/workflows/ci_macos.yml/badge.svg)](https://github.com/dartsim/dart/actions/workflows/ci_macos.yml) [![CI Windows](https://github.com/dartsim/dart/actions/workflows/ci_windows.yml/badge.svg)](https://github.com/dartsim/dart/actions/workflows/ci_windows.yml)                                                                                                                                                                                                        |
 | Doc, Coverage, Linter | [![API Documentation](https://github.com/dartsim/dart/actions/workflows/api_doc.yml/badge.svg)](https://github.com/dartsim/dart/actions/workflows/api_doc.yml)  [![Documentation Status](https://readthedocs.org/projects/dart/badge/?version=latest)](https://dart.readthedocs.io/en/latest/?badge=latest) [![codecov](https://codecov.io/gh/dartsim/dart/branch/main/graph/badge.svg)](https://codecov.io/gh/dartsim/dart)   [![Codacy Badge](https://app.codacy.com/project/badge/Grade/2d95a9b951be4b73a71097670ec351e8)](https://www.codacy.com/gh/dartsim/dart/dashboard?utm_source=github.com&utm_medium=referral&utm_content=dartsim/dart&utm_campaign=Badge_Grade) |
-| Packages              | [![Packaging status](https://repology.org/badge/vertical-allrepos/dartsim.svg)](https://repology.org/project/dartsim/versions) [![Anaconda-Server Badge](https://anaconda.org/conda-forge/dartsim/badges/version.svg)](https://anaconda.org/conda-forge/dartsim) ![PyPI Version](https://img.shields.io/pypi/v/dartpy)
+| Packages              | [![Packaging status](https://repology.org/badge/vertical-allrepos/dartsim.svg)](https://repology.org/project/dartsim/versions) [![Anaconda-Server Badge](https://anaconda.org/conda-forge/dartsim/badges/version.svg)](https://anaconda.org/conda-forge/dartsim) [![PyPI Version](https://img.shields.io/pypi/v/dartpy)](https://pypi.org/project/dartpy/)
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 | Maintenance           | [![Average time to resolve an issue](http://isitmaintained.com/badge/resolution/dartsim/dart.svg)](http://isitmaintained.com/project/dartsim/dart "Average time to resolve an issue") [![Percentage of issues still open](http://isitmaintained.com/badge/open/dartsim/dart.svg)](http://isitmaintained.com/project/dartsim/dart "Percentage of issues still open")                                                                                                                                                                                                                                                                                                                     |