Update README.md: fix tests batch

Author: ourownstory

README.md

@@ -3,7 +3,7 @@
 [![Python Version](https://img.shields.io/badge/python-3.9+-blue?logo=python)](https://www.python.org/)
 [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 [![License](https://img.shields.io/badge/license-MIT-brightgreen)](https://opensource.org/licenses/MIT)
-[![Tests](https://github.com/ourownstory/neural_prophet/actions/workflows/ci.yml/badge.svg)](https://github.com/ourownstory/neural_prophet/actions/workflows/ci.yml)
+[![Tests](https://github.com/ourownstory/neural_prophet/actions/workflows/tests.yml/badge.svg)](https://github.com/ourownstory/neural_prophet/actions/workflows/tests.yml)
 [![codecov](https://codecov.io/gh/ourownstory/neural_prophet/branch/master/graph/badge.svg?token=U5KXCL55DW)](https://codecov.io/gh/ourownstory/neural_prophet)
 [![Slack](https://img.shields.io/badge/slack-@neuralprophet-CF0E5B.svg?logo=slack&logoColor=white&labelColor=3F0E40)](https://neuralprophet.slack.com/join/shared_invite/zt-sgme2rw3-3dCH3YJ_wgg01IXHoYaeCg#/shared-invite/email)
 [![Downloads](https://static.pepy.tech/personalized-badge/neuralprophet?period=total&units=international_system&left_color=black&right_color=blue&left_text=Downloads)](https://pepy.tech/project/neuralprophet)