chore(ci): upgrade InfluxDB 1.7 to 1.8 (#104)

[bednar]

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

[codecov-commenter]

Codecov Report

Merging #123 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #123   +/-   ##
=========================================
  Coverage     91.27%   91.27%           
  Complexity      441      441           
=========================================
  Files           137      137           
  Lines          5373     5373           
  Branches        201      201           
=========================================
  Hits           4904     4904           
  Misses          388      388           
  Partials         81       81           

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