Remove get_excluded_fields function from manager – shouldn't be part …

[rossmechanic]

…of public API

Description

In #477, get_excluded_fields was added to the history manager since the initial version of that PR had a more complicated function definition for get_excluded_fields. Since that function is only now used in one place and only consists of one line, I'd rather not have it part of the public API for history manager, so I'm removing it before the next release.

Related Issue

Motivation and Context

How Has This Been Tested?

All current tests pass

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have run the make format command to format my code
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have added my name and/or github handle to AUTHORS.rst
• I have added my change to CHANGES.rst
• All new and existing tests passed.

[codecov-io]

Codecov Report

Merging #515 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #515      +/-   ##
==========================================
- Coverage   97.71%   97.71%   -0.01%     
==========================================
  Files          17       17              
  Lines         832      830       -2     
  Branches      114      114              
==========================================
- Hits          813      811       -2     
  Misses          8        8              
  Partials       11       11

Impacted Files	Coverage Δ
simple_history/manager.py	93.93% <100%> (-0.18%)	⬇️

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[kseever]

Sounds good to me.