Improve library coverage

[mborland]

Closes: #175

[codecov]

Codecov Report

❌ Patch coverage is 99.24812% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.8%. Comparing base (1b193bc) to head (8bbd8a7).
⚠️ Report is 8 commits behind head on develop.

Files with missing lines	Patch %	Lines
test/test_literals.cpp	98.7%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           develop    #225     +/-   ##
=========================================
+ Coverage     97.4%   98.8%   +1.4%     
=========================================
  Files          207     210      +3     
  Lines        15063   15196    +133     
  Branches      5722    5675     -47     
=========================================
+ Hits         14660   15002    +342     
+ Misses         326     116    -210     
- Partials        77      78      +1     

Files with missing lines	Coverage Δ
include/boost/safe_numbers/bounded_floats.hpp	100.0% <ø> (+5.2%)	⬆️
include/boost/safe_numbers/bounded_integers.hpp	99.0% <ø> (+13.5%)	⬆️
include/boost/safe_numbers/detail/float_basis.hpp	90.8% <ø> (+11.4%)	⬆️
...boost/safe_numbers/detail/signed_integer_basis.hpp	95.8% <ø> (+11.6%)	⬆️
...ost/safe_numbers/detail/unsigned_integer_basis.hpp	93.8% <ø> (+6.1%)	⬆️
test/test_bounded_limits.cpp	100.0% <100.0%> (ø)
test/test_signed_bounded_modulo.cpp	100.0% <100.0%> (ø)
test/test_signed_bounded_unary.cpp	100.0% <100.0%> (ø)
test/test_unsigned_bounded_modulo.cpp	100.0% <100.0%> (ø)
test/test_unsigned_bounded_unary.cpp	100.0% <100.0%> (ø)
... and 1 more

... and 3 files with indirect coverage changes

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