Fix fractional(0.333) output in README

[hugovk]

Fixes #133.

Changes proposed in this pull request:

• Add the fractional examples from the README as test cases
• Fix the output of humanize.fractional(0.333) from '1/3' to '333/1000' in the README and test case
• Add some missing quotes around string outputs

[codecov-commenter]

Codecov Report

Merging #134 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #134   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines          416       416           
=========================================
  Hits           416       416           

Flag	Coverage Δ
#GHA_Ubuntu	100.00% <ø> (ø)
#GHA_Windows	100.00% <ø> (ø)
#GHA_macOS	100.00% <ø> (ø)

Impacted Files	Coverage Δ
tests/test_number.py	100.00% <ø> (ø)

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