SumoLogicAppenderTest cleanup and new tests for SumoLogicAppender.newBuilder()

[raphisuter]

I did some small improvements in README.md (add borders/pipe symbols) to all table rows, cleaned up some unnecessary code in SumoLogicAppenderTest and wrote some new tests for the builder of SumoLogicAppender. There were also some occurrences left of hardcoded newLine characters \n in the tests which have been cleaned up as well. (see #51)

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +39.23% 🎉

Comparison is base (a820c53) 38.46% compared to head (de3f65e) 77.69%.
Report is 18 commits behind head on master.

❗ Current head de3f65e differs from pull request most recent head d8d0101. Consider uploading reports for the commit d8d0101 to get more accurate results

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Additional details and impacted files

@@              Coverage Diff              @@
##             master      #52       +/-   ##
=============================================
+ Coverage     38.46%   77.69%   +39.23%     
- Complexity        7       10        +3     
=============================================
  Files             1        1               
  Lines           130      130               
  Branches          2        2               
=============================================
+ Hits             50      101       +51     
+ Misses           76       27       -49     
+ Partials          4        2        -2     

see 1 file with indirect coverage changes

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[mccartney]

Thanks a lot of for this contribution.