Drop deprecated seq method

main/src/main/scala/sbt/Defaults.scala

@@ -2415,10 +2415,6 @@ trait BuildExtra extends BuildCommon with DefExtra {
       Seq(artLocal := artifact.value, taskLocal := taskDef.value, art, pkgd)
     }
 
-  // because this was commonly used, this might need to be kept longer than usual
-  @deprecated("In build.sbt files, this call can be removed.  In other cases, this can usually be replaced by Seq.", "0.13.0")
-  def seq(settings: Setting[_]*): SettingsDefinition = new Def.SettingList(settings)
-
   def externalIvySettings(file: Initialize[File] = inBase("ivysettings.xml"), addMultiResolver: Boolean = true): Setting[Task[IvyConfiguration]] =
     externalIvySettingsURI(file(_.toURI), addMultiResolver)
 

sbt/src/sbt-test/dependency-management/ivy-settings-a/build.sbt

@@ -1,8 +1,8 @@
 import sbt.internal.librarymanagement.syntax._
 
-seq(externalIvySettings(), externalIvyFile())
+Seq(externalIvySettings(), externalIvyFile())
 
 TaskKey[Unit]("check") := {
 	val files = update.value.matching( moduleFilter(organization = "org.scalacheck", name = "scalacheck*", revision = "1.11.4") )
 	assert(files.nonEmpty, "ScalaCheck module not found in update report")
-}
+}

sbt/src/sbt-test/project/load-hooks/build.sbt

@@ -1,5 +1,3 @@
-
-
 {
   val loadCount = AttributeKey[Int]("load-count")
   val unloadCount = AttributeKey[Int]("unload-count")
@@ -7,9 +5,9 @@
     val previous = s get key getOrElse 0
     s.put(key, previous + 1)
   }
-  seq(
-	onLoad in Global ~= (f(loadCount) compose _),
-	onUnload in Global ~= (f(unloadCount) compose _)
+  Seq(
+    onLoad in Global ~= (f(loadCount) compose _),
+    onUnload in Global ~= (f(unloadCount) compose _)
   )
 }