Update mock to 3.0.3

[pyup-bot]

This PR updates mock from 3.0.2 to 3.0.3.

Changelog

3.0.3

-----

- Fixed patching of dictionaries, when specifing the target with a
unicode on Python 2.

Links

• PyPI: https://pypi.org/project/mock
• Changelog: https://pyup.io/changelogs/mock/
• Docs: http://mock.readthedocs.org/en/latest/

[codecov]

Codecov Report

Merging #617 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #617   +/-   ##
=======================================
  Coverage   95.65%   95.65%           
=======================================
  Files          55       55           
  Lines        2856     2856           
=======================================
  Hits         2732     2732           
  Misses        124      124

---

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[codecov]

Codecov Report

Merging #617 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #617   +/-   ##
=======================================
  Coverage   95.65%   95.65%           
=======================================
  Files          55       55           
  Lines        2856     2856           
=======================================
  Hits         2732     2732           
  Misses        124      124

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 82c2709...c2e40f6. Read the comment docs.

[pyup-bot]

Closing this in favor of #619