Get rid of all the extra 0.5.0 markers in the changelog
Get rid of all the extra 0.5.0 markers in the changelog

michaeldwan/sss,GSA/aws-s3,appfolio/aws-s3,International/aliyun-oss-sdk-for-ruby,sauberia/aws-s3,github/aws-s3,AlphaStaxLLC/aws-s3,github/aws-s3,mDialog/aws-s3,felixbuenemann/aws-s3,marcel/aws-s3,AlphaStaxLLC/aws-s3,chef/aws-s3,spatten/aws-s3,mmontalvo/aws-s3,gentoo/aws-s3,lantrix/aws-s3,International/aliyun-oss-sdk-for-ruby,lantrix/aws-s3,jwarchol/aws-s3,mangege/aliyun-oss-sdk-for-ruby,nagash/aws-s3,square/aws-s3,dctanner/aws-s3,mmontalvo/aws-s3