fix: writes uses precision from Point instead a default precision

[bednar]

Closes #100

• CHANGELOG.md updated
• Rebased/mergeable
• Tests pass
• Sign CLA (if not already signed)

[codecov-commenter]

Codecov Report

Merging #108 into master will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #108      +/-   ##
==========================================
+ Coverage   88.65%   88.71%   +0.05%     
==========================================
  Files          22       22              
  Lines        1798     1807       +9     
==========================================
+ Hits         1594     1603       +9     
  Misses        204      204              

Impacted Files	Coverage Δ
influxdb_client/client/write/point.py	98.27% <100.00%> (+0.04%)	⬆️
influxdb_client/client/write_api.py	96.61% <100.00%> (+0.08%)	⬆️

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