ConfigureAwaitAnalyzer VS2019 v0.1.1-beta.2

CHANGES:
Included in VS2019 version of the package

• Use type checking instead of check the suffix in the string representation of AwaitExpressionSyntax
• Avoid some edge cases like:
  • Await an already configured task (invoked as variable)
  • Await calls in Controller Actions in ASP.NET Core projects