Replace porter_stemmer with snowball_stemmer #70
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The Snowball/Porter2 stemming algorithm performs better than the original Porter stemmer on a significant subset of words, in the sense that the stems produced are more in line with what one would expect.
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The Snowball/Porter2 stemming algorithm performs better than the original Porter stemmer on a significant subset of words, in the sense that the stems produced are more in line with what one would expect.
I checked that all the unit tests pass after the change.