Add missing language.higherKinds imports

core/shared/src/main/scala/coursier/Fetch.scala

@@ -1,6 +1,6 @@
 package coursier
 
-import coursier.maven.MavenSource
+import scala.language.higherKinds
 
 import scalaz._
 

core/shared/src/main/scala/coursier/core/ResolutionProcess.scala

@@ -3,6 +3,7 @@ package core
 
 import scalaz._
 import scala.annotation.tailrec
+import scala.language.higherKinds
 
 
 sealed abstract class ResolutionProcess {

core/shared/src/main/scala/coursier/ivy/IvyRepository.scala

@@ -3,6 +3,8 @@ package coursier.ivy
 import coursier.Fetch
 import coursier.core._
 
+import scala.language.higherKinds
+
 import scalaz._
 import scalaz.Scalaz._
 

plugin/src/main/scala-2.10/coursier/FallbackDependenciesRepository.scala

@@ -3,6 +3,8 @@ package coursier
 import java.io.{ File, FileNotFoundException, IOException }
 import java.net.{ HttpURLConnection, URL, URLConnection }
 
+import scala.language.higherKinds
+
 import scalaz.{ EitherT, Monad }
 
 object FallbackDependenciesRepository {

plugin/src/main/scala-2.10/coursier/InterProjectRepository.scala

@@ -1,5 +1,7 @@
 package coursier
 
+import scala.language.higherKinds
+
 import scalaz.{ -\/, \/-, Monad, EitherT }
 
 case class InterProjectRepository(projects: Seq[Project]) extends Repository {

tests/shared/src/test/scala/coursier/test/TestRepository.scala

@@ -3,6 +3,8 @@ package test
 
 import coursier.core._
 
+import scala.language.higherKinds
+
 import scalaz.{ Monad, EitherT }
 import scalaz.Scalaz._