fix: timeout can be specified as a float

[bednar]

Closes #383

Proposed Changes

Timeout can be specified as a float.

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 #384 (0890cba) into master (0ebe302) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #384   +/-   ##
=======================================
  Coverage   92.90%   92.90%           
=======================================
  Files          28       28           
  Lines        2395     2395           
=======================================
  Hits         2225     2225           
  Misses        170      170           

Impacted Files	Coverage Δ
influxdb_client/rest.py	85.18% <100.00%> (ø)

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