Fixed the .bump method #231
                
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Hi Dominic,
While working on the Advanced Derivatives coursework with M. Kerkhof, I noticed that the
.bumpmethod indiscount_curve.pywas not behaving as expected.This PR proposes a fix to ensure that the method correctly bumps the curve values, allowing users to adjust the curve reliably.
Changes made:
.bumpExample usage after fix can be found in the
FINDISCOUNTCURVE_Introduction.ipynbnotebook.I would be happy to receive feedback or suggestions on this implementation.
Thank you,
Sami