Change release status to pre-released version
# Streaming Integrator
[![Jenkins Build Status](https://wso2.org/jenkins/view/wso2-dependencies/job/products/job/streaming-integrator/badge/icon)](https://wso2.org/jenkins/view/wso2-dependencies/job/products/job/streaming-integrator/)
- [![GitHub Release](https://img.shields.io/github/release/wso2/streaming-integrator.svg)](https://github.com/wso2/streaming-integrator/releases/)
- [![GitHub Release Date](https://img.shields.io/github/release-date/wso2/streaming-integrator.svg)](https://github.com/wso2/streaming-integrator/releases)
+ [![GitHub Release](https://img.shields.io/github/release-pre/wso2/streaming-integrator.svg)](https://github.com/wso2/streaming-integrator/releases/)
+ [![GitHub Release Date](https://img.shields.io/github/release-date-pre/wso2/streaming-integrator.svg)](https://github.com/wso2/streaming-integrator/releases)
[![GitHub Open Issues](https://img.shields.io/github/issues-raw/wso2/streaming-integrator.svg)](https://github.com/wso2/streaming-integrator/commits/master)
[![GitHub Last Commit](https://img.shields.io/github/last-commit/wso2/streaming-integrator.svg)](https://github.com/wso2/streaming-integrator/commits/master)
[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
