chore: default port changed to 8086

[bednar]

Closes #49

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

@@           Coverage Diff           @@
##           master      #50   +/-   ##
=======================================
  Coverage   99.37%   99.37%           
=======================================
  Files          12       12           
  Lines         638      638           
=======================================
  Hits          634      634           
  Misses          4        4           

Impacted Files	Coverage Δ
lib/influxdb2/client/client.rb	100.00% <ø> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update f67d05a...5488fcb. Read the comment docs.