Update readme

Author: rdtsc

Diff for: readme.md

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 As of 2018-02-12, [CodeEval][ce] has ceased operations. At the time of this
 writing, the challenge problem statements are no longer publicly accessible.
 This repository mirrors the problem statements for all 239* interactive
-challenges.
+challenges that once lived on the platform.
 
 <sup>* Challenge #127 ("Code Plagiarism") is not included because no points
 were awarded for it by the online judge.</sup>