fix: use platform indepentent line seperator

[sandrozbinden]

Currently the created markdown uses hardcoded "\n" line seperators. This fix changes the behaviour to use the java System.lineSeperator() method that uses the correct line seperator according to the current os environment.

Closes #7

[codecov[bot]]

Codecov Report

Merging #8 into master will increase coverage by 0.3%. The diff coverage is 85.71%.

@@             Coverage Diff             @@
##             master       #8     +/-   ##
===========================================
+ Coverage     68.97%   69.28%   +0.3%     
- Complexity        0      182    +182     
===========================================
  Files            31       31             
  Lines           606      612      +6     
  Branches         64       46     -18     
===========================================
+ Hits            418      424      +6     
  Misses          168      168             
  Partials         20       20

Impacted Files	Coverage Δ	Complexity Δ
...eppschuh/markdowngenerator/list/UnorderedList.java	88.88% <100%> (ø)	11 <0> (+11)	:arrow_up:
...pschuh/markdowngenerator/text/heading/Heading.java	57.69% <100%> (ø)	7 <0> (+7)	:arrow_up:
...ppschuh/markdowngenerator/text/code/CodeBlock.java	91.66% <100%> (ø)	5 <1> (+5)	:arrow_up:
...steppschuh/markdowngenerator/text/quote/Quote.java	81.81% <100%> (ø)	4 <0> (+4)	:arrow_up:
.../net/steppschuh/markdowngenerator/table/Table.java	71.32% <66.66%> (ø)	26 <0> (+26)	:arrow_up:
...huh/markdowngenerator/text/quote/QuoteBuilder.java	81.81% <0%> (+6.81%)	4% <0%> (+4%)	:arrow_up:
.../markdowngenerator/text/code/CodeBlockBuilder.java	58.82% <0%> (+8.82%)	4% <0%> (+4%)	:arrow_up:

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[Steppschuh]

Thanks for your contribution!

[sandrozbinden]

@Steppschuh will there be a new version on maven central for this fix?

[Steppschuh]

Hey @sandrozbinden, sorry for the delay. The new version should be available here.