Remove appveyor reference link from readme file
@@ -2,7 +2,6 @@ Siddhi
======
[![Jenkins Build Status](https://wso2.org/jenkins/view/wso2-dependencies/job/siddhi/job/siddhi/badge/icon)](https://wso2.org/jenkins/view/wso2-dependencies/job/siddhi/job/siddhi)
- [![AppVeyor Build Status](https://ci.appveyor.com/api/projects/status/97xlytm8di5l0pmb/branch/master?svg=true)](https://ci.appveyor.com/project/WSO2/ballerina-lang/branch/master)
[![GitHub (pre-)release](https://img.shields.io/github/release/siddhi-io/siddhi/all.svg)](https://github.com/siddhi-io/siddhi/releases)
[![GitHub (Pre-)Release Date](https://img.shields.io/github/release-date-pre/siddhi-io/siddhi.svg)](https://github.com/siddhi-io/siddhi/releases)
[![GitHub last commit](https://img.shields.io/github/last-commit/siddhi-io/siddhi.svg)](https://github.com/siddhi-io/siddhi/commits/master)
