pseudo-boolean-0.1.4.0: CHANGELOG.markdown

0.1.4.0
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* add Megaparsec-based parsers

0.1.3.0
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* relax the grammer of OPB/WBO files to allow ommitng spaces at the end of weighted terms.

0.1.2.0
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* relax the grammer of OPB/WBO files to allow various use of space characters.

0.1.1.0
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* parse* functions fails if the parser does not consume all of the inputs
* generate '#product=', 'sizeproduct=' and '#soft=' in header line of OPB/WBO files
* sort literals in a non-linear term when generating OPB/WBO files