0.3
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 - Do not assume buildout::parts to be linebreak-separated. It could be
   normalized to whitespace-separated values by some other code.

0.2
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 - Improve the way to declare a section extender by having a single
   option 'section-extender' and one section per line as its values.
   Many thanks to Mustapha Benali for the review and suggestion.

0.1
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 - initial release