adds to contributors.txt
adds to contributors.txt

paalge/scikit-image,ofgulban/scikit-image,vighneshbirodkar/scikit-image,paalge/scikit-image,paalge/scikit-image,rjeli/scikit-image,ofgulban/scikit-image,rjeli/scikit-image,ofgulban/scikit-image,vighneshbirodkar/scikit-image,vighneshbirodkar/scikit-image,rjeli/scikit-image