add 100km to section 4D.15.1 Distance Measurement for Traditional distances

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Comments about this discussion:

Started 23 Apr 11:19

Comment 23 Apr 13:10

I guess we should not discuss here but in the original discussion?

It is here (hope the link works):
https://iuf-rulebook-2018.committees.unicycling-software.com/discussions/58

I have some small comments and will type them there.