Update FEATURES.md

Cleared features now in 1.9.0

Author: jajhall

FEATURES.md

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 ## Build changes
 
-Python: Source Distribution update, added to PyPI
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 ## Code changes
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-HiGHS now handles multiple linear objectives by either blending using weights, or performing lexicographic optimization: see https://ergo-code.github.io/HiGHS/stable/guide/further/#guide-multi-objective-optimization
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-Fixed minor bug in bound checking in presolve
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-Fixed bug in `floor(HighsCDouble x)` and `ceil(HighsCDouble x)` when argument is small
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-Added some sanity checks to Highs::writeLocalModel to prevent segfaults if called directly by a user
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