Remove Bintray download badge and obsolete release.md

See #17

Author: neiser

README.md

@@ -3,7 +3,6 @@
 [![Build Status](https://github.com/qaware/openapi-generator-for-spring/workflows/build/badge.svg?branch=master)](https://github.com/qaware/openapi-generator-for-spring/actions?query=workflow%3A%22build%22)
 [![Quality Gate Status](https://sonarcloud.io/api/project_badges/measure?project=qaware_openapi-generator-for-spring&metric=alert_status)](https://sonarcloud.io/dashboard?id=qaware_openapi-generator-for-spring)
 [![Code Coverage](https://sonarcloud.io/api/project_badges/measure?project=qaware_openapi-generator-for-spring&metric=coverage)](https://sonarcloud.io/dashboard?id=qaware_openapi-generator-for-spring)
-[![Bintray Download](https://api.bintray.com/packages/qaware-oss/maven/openapi-generator-for-spring/images/download.svg) ](https://bintray.com/qaware-oss/maven/openapi-generator-for-spring/_latestVersion)
 [![Maven Central](https://img.shields.io/maven-central/v/de.qaware.tools.openapi-generator-for-spring/openapi-generator-for-spring-starter)](https://mvnrepository.com/artifact/de.qaware.tools.openapi-generator-for-spring/openapi-generator-for-spring-starter)
 
 This library automagically generates a [OpenApi v3 specification](https://github.com/OAI/OpenAPI-Specification) at