chore: default port changed to 8086

[bednar]

Closes #149

Proposed Changes

• default port changed to 8086

Checklist

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

[codecov-commenter]

Codecov Report

Merging #151 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #151   +/-   ##
=======================================
  Coverage   89.14%   89.14%           
=======================================
  Files          25       25           
  Lines        1916     1916           
=======================================
  Hits         1708     1708           
  Misses        208      208           

Impacted Files	Coverage Δ
influxdb_client/client/influxdb_client.py	98.37% <100.00%> (ø)

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