fix: mapping dictionary without timestamp and tags into LineProtocol

[bednar]

Closes #103

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

[codecov-commenter]

Codecov Report

Merging #105 into master will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #105      +/-   ##
==========================================
+ Coverage   88.64%   88.65%   +0.01%     
==========================================
  Files          22       22              
  Lines        1796     1798       +2     
==========================================
+ Hits         1592     1594       +2     
  Misses        204      204              

Impacted Files	Coverage Δ
influxdb_client/client/write/point.py	98.23% <100.00%> (+0.03%)	⬆️

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