feat: remove trailing slash from connection URL

[bednar]

Releated-to influxdata/influxdb-client-python#87

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

[codecov-io]

Codecov Report

Merging #92 into master will increase coverage by 0.18%.
The diff coverage is 27.05%.

@@            Coverage Diff             @@
##           master      #92      +/-   ##
==========================================
+ Coverage   15.96%   16.15%   +0.18%     
==========================================
  Files          47       49       +2     
  Lines        4641     4792     +151     
  Branches      224      228       +4     
==========================================
+ Hits          741      774      +33     
- Misses       3880     3998     +118     
  Partials       20       20              

Impacted Files	Coverage Δ
Client.Core.Test/ArgumentsDurationTest.cs	0.00% <0.00%> (ø)
Client.Core.Test/ArgumentsTest.cs	0.00% <0.00%> (ø)
Client.Core/Arguments.cs	16.00% <ø> (ø)
Client/InfluxDBClient.cs	0.00% <0.00%> (ø)
Client/Internal/ApiClient.cs	0.00% <0.00%> (ø)
Client/WriteApi.cs	0.00% <0.00%> (ø)
Client.Core/Exceptions/InfluxException.cs	89.18% <87.09%> (+1.43%)	⬆️
Client.Core/Internal/AbstractQueryClient.cs	76.81% <100.00%> (ø)
Client.Legacy/FluxClient.cs	98.37% <100.00%> (+0.06%)	⬆️
Client.Legacy/FluxConnectionOptions.cs	100.00% <100.00%> (ø)
... and 3 more

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