Update URL for pyftpdlib.
Update URL for pyftpdlib.

This project was hosted on Google Code, but has moved to github.

BUG=chromium:476190

Review URL: https://codereview.chromium.org/1392213003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#353064}

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