docs: Async examples

[michaelahojna]

Closes #54

Edit examples to async

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• swift test completes successfully
• Commit messages are conventional
• Sign CLA (if not already signed)

[codecov-commenter]

Codecov Report

Base: 49.07% // Head: 65.25% // Increases project coverage by +16.17% 🎉

Coverage data is based on head (a38662a) compared to base (a8ce9a2).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff             @@
##           master      #55       +/-   ##
===========================================
+ Coverage   49.07%   65.25%   +16.17%     
===========================================
  Files         145       17      -128     
  Lines        9017     1321     -7696     
===========================================
- Hits         4425      862     -3563     
+ Misses       4592      459     -4133     

Impacted Files	Coverage Δ
Sources/InfluxDBSwift/DeleteAPI.swift	79.72% <ø> (ø)
Sources/InfluxDBSwift/QueryAPI.swift	64.42% <ø> (ø)
Sources/InfluxDBSwift/WriteAPI.swift	61.09% <ø> (ø)
...uxDBSwiftTests/AAJunitReportInitializerTests.swift
...nfluxDBSwiftApis/Generated/Models/DBRPUpdate.swift
...InfluxDBSwiftApis/Generated/Models/TaskLinks.swift
Tests/InfluxDBSwiftApisTests/ReadyAPITests.swift
Tests/InfluxDBSwiftApisTests/DBRPsAPITests.swift
...is/Generated/Models/AuthorizationPostRequest.swift
Tests/InfluxDBSwiftTests/QueryAPITests.swift
... and 121 more

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[bednar]

Thanks for your PR 👍

Please migrate the Query to Data example to async/await too:

[bednar]

LGTM 🚀