Merge pull request #3519 from FAnett1997/patch-1

Code maintainability by QualityGate

README.md

@@ -7,6 +7,7 @@
 [![GitHub release](https://img.shields.io/github/release/alibaba/fastjson.svg)](https://github.com/alibaba/fastjson/releases)
 [![License](https://img.shields.io/badge/license-Apache%202-4EB1BA.svg)](https://www.apache.org/licenses/LICENSE-2.0.html)
 [![Gitpod Ready-to-Code](https://img.shields.io/badge/Gitpod-Ready--to--Code-blue?logo=gitpod)](https://gitpod.io/#https://github.com/alibaba/fastjson) 
+[![QualityGate](https://quality-gate.com/backend/api/timeline?branchName=master&projectName=alibaba_fastjson)](https://quality-gate.com/dashboard/branches/7816#overview)
 
 Fastjson is a Java library that can be used to convert Java Objects into their JSON representation. It can also be used to convert a JSON string to an equivalent Java object. Fastjson can work with arbitrary Java objects including pre-existing objects that you do not have source-code of.