preserve single line break

[BhavinPatel04]

Description

Preserve single line break and convert multiple line breaks into single line break in HTML

Checklist:

• I have updated/added documentation affected by my changes.
• I have added tests to cover my changes.

[codecov]

Codecov Report

Merging #108 into master will increase coverage by 1.12%.
The diff coverage is 93.13%.

@@            Coverage Diff             @@
##           master     #108      +/-   ##
==========================================
+ Coverage   40.21%   41.34%   +1.12%     
==========================================
  Files          65       66       +1     
  Lines        1840     1877      +37     
==========================================
+ Hits          740      776      +36     
- Misses       1100     1101       +1     

Impacted Files	Coverage Δ
packages/migrate/src/cli.js	0.00% <0.00%> (ø)
...rate/src/util/default-migrations/component-file.js	50.00% <0.00%> (ø)
packages/prettyprint/src/util/formatArgument.js	93.33% <93.33%> (ø)
packages/migrate/src/index.js	92.68% <100.00%> (+1.77%)	⬆️
...kages/migrate/src/util/default-migrations/index.js	100.00% <100.00%> (ø)
...igrate/src/util/default-migrations/update-paths.js	100.00% <100.00%> (ø)
packages/prettyprint/src/PrintContext.js	100.00% <100.00%> (ø)
packages/prettyprint/src/prettyPrintAST.js	93.75% <100.00%> (+0.41%)	⬆️
packages/prettyprint/src/prettyPrintSource.js	89.47% <100.00%> (+0.58%)	⬆️
packages/prettyprint/src/printHtmlElement.js	100.00% <100.00%> (ø)
... and 8 more

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