Guarantees support for async<T>

[CheslauBachko]

No description provided.

[codecov]

Codecov Report

Merging #54 (6998c6b) into master (743fbf2) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #54   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         4           
  Lines           75        59   -16     
=========================================
- Hits            75        59   -16     

Impacted Files	Coverage Δ
Sources/AwaitKit/AwaitKit.swift	100.00% <100.00%> (ø)
Sources/AwaitKit/DispatchQueue+Async.swift	100.00% <0.00%> (ø)
Sources/AwaitKit/DispatchQueue+Await.swift	100.00% <0.00%> (ø)

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