Include Python-dotenv in our Requirements

[kushthedude]

Description:

Include Python-dotenv in our Requirements to remove the generated warnings indicating the presence of .env files.

Stacktrace:

Users/kush/open-event-server/venv/lib/python3.7/site-packages/flask_limiter/extension.py:113: UserWarning: Use of the default `get_ipaddr` function is discouraged. Please refer to https://flask-limiter.readthedocs.org/#rate-limit-domain for the recommended configuration
  " for the recommended configuration", UserWarning
 * Tip: There are .env or .flaskenv files present. Do "pip install python-dotenv" to use them.

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