Fix a url path in README.md
Fix a url path in README.md

CloudCredo/cf-mysql-release,krishna-mk/cf-mysql-release,kbastani/cf-mysql-release,CloudCredo/cf-mysql-release,CloudCredo/cf-mysql-release,cloudfoundry/cf-mysql-release,cloudfoundry/cf-mysql-release,krishna-mk/cf-mysql-release,cloudfoundry/cf-mysql-release,kbastani/cf-mysql-release,kbastani/cf-mysql-release,krishna-mk/cf-mysql-release,cloudfoundry/cf-mysql-release