Newline fix

[willmcgugan]

Type of changes

• Bug fix
• New feature
• Documentation / docstrings
• Tests
• Other

Checklist

• I've run the latest black with default args on new code.
• I've updated CHANGELOG.md and CONTRIBUTORS.md where appropriate.
• I've added tests for new code.
• I accept that @willmcgugan may be pedantic in the code review.

Description

Prevent newlines from being omitted #178
Fixes Progress.track #184
Improved support for 16 colours

[codecov]

Codecov Report

Merging #180 into master will increase coverage by 0.90%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #180      +/-   ##
==========================================
+ Coverage   97.54%   98.44%   +0.90%     
==========================================
  Files          50       50              
  Lines        3786     3795       +9     
==========================================
+ Hits         3693     3736      +43     
+ Misses         93       59      -34     

Flag	Coverage Δ
#unittests	98.44% <100.00%> (+0.90%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
rich/__main__.py	100.00% <ø> (ø)
rich/_palettes.py	100.00% <100.00%> (ø)
rich/color.py	100.00% <100.00%> (ø)
rich/console.py	100.00% <100.00%> (ø)
rich/markdown.py	100.00% <100.00%> (ø)
rich/palette.py	100.00% <100.00%> (ø)
rich/progress.py	95.03% <100.00%> (+7.26%)	⬆️
rich/syntax.py	95.13% <100.00%> (+0.06%)	⬆️
rich/text.py	100.00% <100.00%> (ø)

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