chore: default port changed to 8086

[bednar]

Closes #14

Proposed Changes

• default port changed to 8086

Checklist

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

[codecov-commenter]

Codecov Report

Merging #15 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #15   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines           89        89           
=========================================
  Hits            89        89           

Impacted Files	Coverage Δ
lib/fluent/plugin/out_influxdb2.rb	100.00% <100.00%> (ø)

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