Support try expression

[kishikawakatsumi]

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[codecov]

Codecov Report

Merging #20 into master will not change coverage.
The diff coverage is 96.94%.

@@           Coverage Diff           @@
##           master      #20   +/-   ##
=======================================
  Coverage   86.37%   86.37%           
=======================================
  Files           8        8           
  Lines        2011     2011           
  Branches       43       43           
=======================================
  Hits         1737     1737           
  Misses        274      274

Impacted Files	Coverage Δ
.../SwiftPowerAssertTests/SwiftPowerAssertTests.swift	100% <100%> (ø)	⬆️
...ources/SwiftPowerAssertCore/SwiftPowerAssert.swift	83.96% <100%> (ø)	⬆️
Sources/SwiftPowerAssertCore/Instrumentor.swift	91.89% <92.98%> (ø)	⬆️

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