Update documentation for pyup-bot PRs

[FabioRosado]

Description

Updated the maintainers documentation with a section about pyup-bot PR.

Status

READY | UNDER DEVELOPMENT | ON HOLD

Type of change

Please delete options that are not relevant.

• Documentation (fix or adds documentation)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration.

• N/a
• N/a

Checklist:

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation (if applicable)
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov]

Codecov Report

Merging #485 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #485   +/-   ##
======================================
  Coverage    99.9%   99.9%           
======================================
  Files          18      18           
  Lines        1095    1095           
======================================
  Hits         1094    1094           
  Misses          1       1

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[jacobtomlinson]

👍