show updates for non-final packages and show "#was" comment in the same line as the readme suggests
single line output for easy grepping upgdateable packages

the section "The old comments are removed:" does not make sense in this case.
we might rename it to "lets pin our updated eggs"
and remove the line "# was: zope.interface=3.4.0"
remove unnecessary whitespace and just print old version instead of repeating name=version
Merge pull request #1 from zopefoundation/use_dev_releases

show updates for non-final packages