Merge pull request #1658 from iainnicol/master

Target: update DoNothing signature

Author: matthid

src/app/Fake.Core.Targets/Target.fs

@@ -125,8 +125,8 @@ module Target =
           |> String.separated ", "
           |> sprintf "(?=> %s)"
 
-    /// Do nothing - fun () -> () - Can be used to define empty targets.
-    let DoNothing = (fun () -> ())
+    /// Do nothing - Can be used to define empty targets.
+    let DoNothing = (fun (_:TargetParameter) -> ())
 
     /// Checks whether the dependency (soft or normal) can be added.
     /// [omit]