bugs#125 - changing all python2_7 without any trailing comment to py2+py3 support
searching for ^PYTHON_COMPAT=\(\s*?python2_7\s*?\)$
and replacing with PYTHON_COMPAT=( python2_7 python3_{5,6,7,8} )
searching for ^PYTHON_COMPAT=\(\s*?python2_7\s*?\)$
and replacing with PYTHON_COMPAT=( python2_7 python3_{5,6,7,8} )