add update_course_material.sh
better update script
readme 100
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Update README.md
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Merge branch 'master' of https://github.com/hackinscience/course-material
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Woot some new exercices
Fixes by c24b.
FIX by c24b
FIX: errors in exo 45.
 fix error drafts
Nightly update.
add 260
 update readme 260
fix 102
fix 102 tjrs
fix 250