Update to latest version of Iota

[andyscott]

I noticed you were using Iota and I wanted to give you a heads up for when you update to a more recent version.

frees-io/iota#114 changes the bounds on CopK.Inject. The session code will need to be updated as follows:

    object SessionOps {
-      implicit def sessionOpsForIota[F[_] <: CopK[_, _]](implicit I: CopK.Inject[SessionOp, F]): SessionOps[F] = new SessionOps
+      implicit def sessionOpsForIota[F[A] <: CopK[_, A]](implicit I: CopK.Inject[SessionOp, F]): SessionOps[F] = new SessionOps
    }

Cheers!

[tkrs]

@andyscott Thanks for the report! I will get right on it.