fix(deps): update dependency user-util to ^0.3.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
user-util	^0.1.5 -> ^0.3.0

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Release Notes

openedx/user-util (user-util)

### [`v0.3.1`](https://togithub.com/openedx/user-util/blob/HEAD/HISTORY.rst#031-2020-09-16) [Compare Source](https://togithub.com/openedx/user-util/compare/0.2...0.3.1) - Fix versioning mistake ### [`v0.2`](https://togithub.com/openedx/user-util/blob/HEAD/HISTORY.rst#02-2020-05-02) [Compare Source](https://togithub.com/openedx/user-util/compare/0.1.5...0.2) - Drop support to python 2.7 and add support to python 3.8

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