chore: default port changed to 8086

[rhajek]

Closes #39

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• make test completes successfully
• Commit messages are in semantic format
• Sign CLA (if not already signed)

[codecov-commenter]

Codecov Report

Merging #42 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #42   +/-   ##
=========================================
  Coverage     86.31%   86.31%           
  Complexity      294      294           
=========================================
  Files            16       16           
  Lines           665      665           
=========================================
  Hits            574      574           
  Misses           91       91           

Impacted Files	Coverage Δ	Complexity Δ
src/InfluxDB2/Client.php	100.00% <ø> (ø)	6.00 <0.00> (ø)

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