Add force_str to FeaturedPostsPlugin __str__ method

[protoroto]

Description

Add force_str to FeaturedPostsPlugin str method

References

Fix #780

Checklist

• I have read the contribution guide
• Code lint checked via inv lint
• changes file included (see docs)
• Usage documentation added in case of new features
• Tests added

[coveralls]

coverage: 97.167%. remained the same
when pulling 4f5df32 on protoroto:bugfix/issue-780-fix-missing-force-str
into d95802c on nephila:develop.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d95802c) 94.38% compared to head (4f5df32) 94.38%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #782   +/-   ##
========================================
  Coverage    94.38%   94.38%           
========================================
  Files           26       26           
  Lines         1871     1871           
  Branches       266      266           
========================================
  Hits          1766     1766           
  Misses          53       53           
  Partials        52       52           

Flag	Coverage Δ
unittests	94.38% <100.00%> (ø)

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