chore(docs): sync up README from docarray

Signed-off-by: dev-bot@jina.ai <Jina Dev Bot>

Author: dev-bot@jina.ai

README.md

@@ -8,6 +8,7 @@
 <a href="https://pypi.org/project/docarray/"><img src="https://img.shields.io/pypi/v/docarray?style=flat-square&amp;label=Release" alt="PyPI"></a>
 <a href="https://codecov.io/gh/docarray/docarray"><img alt="Codecov branch" src="https://img.shields.io/codecov/c/github/docarray/docarray/main?logo=Codecov&logoColor=white&style=flat-square"></a>
 <a href="https://bestpractices.coreinfrastructure.org/projects/6554"><img src="https://bestpractices.coreinfrastructure.org/projects/6554/badge"></a>
+<a href="https://codecov.io/gh/docarray/docarray"><img alt="Codecov branch" src="https://img.shields.io/codecov/c/github/docarray/docarray/master?&logo=Codecov&logoColor=white&style=flat-square"></a>
 <a href="https://pypistats.org/packages/docarray"><img alt="PyPI - Downloads from official pypistats" src="https://img.shields.io/pypi/dm/docarray?style=flat-square"></a>
 <a href="https://discord.gg/WaMp6PVPgR"><img src="https://dcbadge.vercel.app/api/server/WaMp6PVPgR?theme=default-inverted&style=flat-square"></a>
 </p>