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Your task is to solve a 'newcomer' difficulty issue in the 'username-availability' project. Here is the issue:

Issue #38 Mention Python 2 vs 3 support on README.md

Completion of this task requires a merged Pull Request.

Read Git Basics and Newcomer Guide to learn how to prepare your patch properly.

If you do not use git command line, it will be more difficult to amend your patch when a mentor requests changes.