Fix for #29

[youming-lin]

Description

Motivation and Context

#29

How Has This Been Tested?

Added one new unit test

Checklist:

• I have submitted a CLA form
• If applicable, I have updated the documentation accordingly.
• If applicable, I have added tests to cover my changes.

[codecov-io]

Codecov Report

Merging #30 into master will increase coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #30      +/-   ##
==========================================
+ Coverage   90.52%   90.57%   +0.04%     
==========================================
  Files           2        2              
  Lines         401      403       +2     
==========================================
+ Hits          363      365       +2     
  Misses         38       38

Flag	Coverage Δ
#HTMLEntities	90.57% <100%> (+0.04%)	⬆️

Impacted Files	Coverage Δ
Sources/HTMLEntities/String+HTMLEntities.swift	89.44% <100%> (+0.06%)	⬆️

---

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 88efc76...368f2e2. Read the comment docs.