// Comment to get more information during initialization
logLevel := Level.Warn

// Resolvers
resolvers += "Typesafe repository" at "https://repo.typesafe.com/typesafe/releases/"

// Sbt plugins
addSbtPlugin("com.typesafe.play" % "sbt-plugin" % "2.3.4")

addSbtPlugin("net.virtual-void" % "sbt-dependency-graph" % "0.7.4")

addSbtPlugin("org.scala-lang.modules.scalajs" % "scalajs-sbt-plugin" % "0.5.4")

addSbtPlugin("com.typesafe.sbteclipse" % "sbteclipse-plugin" % "2.4.0")

// Comment to get more information during initialization
logLevel := Level.Warn

// Resolvers
resolvers += "Typesafe repository" at "http://repo.typesafe.com/typesafe/releases/"

// Sbt plugins
addSbtPlugin("com.typesafe.play" % "sbt-plugin" % "2.3.4")

addSbtPlugin("net.virtual-void" % "sbt-dependency-graph" % "0.7.4")

addSbtPlugin("org.scala-lang.modules.scalajs" % "scalajs-sbt-plugin" % "0.5.4")

addSbtPlugin("com.typesafe.sbteclipse" % "sbteclipse-plugin" % "2.4.0")

--- 
+++ 
@@ -2,7 +2,7 @@
 logLevel := Level.Warn
 
 // Resolvers
-resolvers += "Typesafe repository" at "http://repo.typesafe.com/typesafe/releases/"
+resolvers += "Typesafe repository" at "https://repo.typesafe.com/typesafe/releases/"
 
 // Sbt plugins
 addSbtPlugin("com.typesafe.play" % "sbt-plugin" % "2.3.4")
Use https to access repository