Report errors when dependency resolution fails (#71)

* Report errors when dependency resolution fails

Function `Lib.reolveDependencies` now checks the result of the coursier dependency
resolution for errors. The return value of the fuction is now a
`Result[Seq[PathRef]]` and errors are signaled by returning an instance
of Failure when errors occur while resolving dependencies.

`ScalaModule` now has a new task called `resolve` which allows for
triggering dependency resolution directly from the cmd line like:
`mill run resolve`.

`ResolveDepsTests` was added to verify failed resolution is properly
detected and reported.

* Remove type signatures in ScalaModule.scala

* Updates from PR comments

1 files changed, 0 insertions, 5 deletions

diff --git a/core/src/main/scala/mill/define/Task.scala b/core/src/main/scala/mill/define/Task.scala
index d8ca8499..7c741487 100644
--- a/core/src/main/scala/mill/define/Task.scala
+++ b/core/src/main/scala/mill/define/Task.scala
@@ -207,9 +207,4 @@ object Task {
     def evaluate(args: Ctx) = (args(0), args(1))
     val inputs = List(source1, source2)
   }
-
-
-
-
-
 }