extend readme
extend readme

esc/setuptools_scm,untitaker/setuptools_scm,untitaker/setuptools_scm,dstufft/setuptools_scm,esc/setuptools_scm,phargogh/setuptools_scm,ionelmc/setuptools_scm,pypa/setuptools_scm,davidszotten/setuptools_scm,davidszotten/setuptools_scm,pypa/setuptools_scm,RonnyPfannschmidt/setuptools_scm,HolgerPeters/setuptools_scm,ionelmc/setuptools_scm,phargogh/setuptools_scm,RonnyPfannschmidt/setuptools_scm,esben/setuptools_scm