Update SimilarityFinder.py

On line 86, modVector1 (length of vector1) was incorrectly set with the value of modVector2 (length of vector2). modVector2, meanwhile was not being square-rooted. This leads both modVector1 and modVector2 to be wrong.
Merge pull request #1 from manoj-sharma-forespire/patch-1

Update SimilarityFinder.py