Remove duplicate license notice

bgmrequested to merge
github/fork/wmortada/remove-duplicate-license into master

Created by: wmortada

It appears that @artfulrobot added another license notice before #103 was merged!

https://github.com/TechToThePeople/civisualize/commit/cba5dd6dc4fdbf3fa2529dbba2032c1445ba54a6

This removes the latter.

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