Support async Main methods

[sharwell]

Fixes #66

[codecov]

Codecov Report

Merging #72 into master will increase coverage by 0.12%.
The diff coverage is 86.79%.

@@            Coverage Diff             @@
##           master      #72      +/-   ##
==========================================
+ Coverage   81.54%   81.66%   +0.12%     
==========================================
  Files          38       38              
  Lines        2943     2995      +52     
  Branches      188      196       +8     
==========================================
+ Hits         2400     2446      +46     
- Misses        444      448       +4     
- Partials       99      101       +2

Impacted Files	Coverage Δ
...geAnalyzers.Test/Naming/UseAsyncSuffixUnitTests.cs	100% <100%> (ø)	⬆️
...yncUsageAnalyzers/Naming/UseAsyncSuffixAnalyzer.cs	100% <100%> (ø)	⬆️
...ncUsageAnalyzers/Helpers/MethodSymbolExtensions.cs	76.54% <72%> (-0.65%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 88e1d22...9a4f3fa. Read the comment docs.

[jeremyVignelles]

Is there any reason why it's not merged yet?

[sharwell]

@jeremyVignelles This project is pretty far behind on state-of-the-art. I'm working with @AArnott to determine if the package should be retired over the next few months in favor of Microsoft.VisualStudio.Threading.Analyzers.