add a change log for release notes
add a change log for release notes

RichardWarburton/lambda-behave,ofdrm/lambda-behave,jypma/lambda-behave,dhunziker/lambda-behave,dhunziker/lambda-behave,ofdrm/lambda-behave,Writtscher/lambda-behave,RichardWarburton/lambda-behave,Writtscher/lambda-behave,jypma/lambda-behave