title: Unresolved dependency: sbt-plugin;2.7.0 when trying to compile a play template project
body: <p>Created a new play template project following the guidance on Play's website "sbt new playframework/play-scala-seed.g8"</p>
  
  <p>Trying to compile/run the project I get the following:</p>
  
  <pre><code>[warn]  ::::::::::::::::::::::::::::::::::::::::::::::
  [warn]  ::          UNRESOLVED DEPENDENCIES         ::
  [warn]  ::::::::::::::::::::::::::::::::::::::::::::::
  [warn]  :: com.typesafe.play#sbt-plugin;2.7.0: Resolution failed several times for dependency: com.typesafe.play#sbt-plugin;2.7.0 {compile=[default(compile)]}:: 
  [warn]  typesafe-ivy-releases: unable to get resource for com.typesafe.play#sbt-plugin;2.7.0: res=https://repo.typesafe.com/typesafe/ivy-releases/com.typesafe.play/sbt-plugin/scala_2.12/sbt_1.0/2.7.0/ivys/ivy.xml: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
  [warn]  sbt-plugin-releases: unable to get resource for com.typesafe.play#sbt-plugin;2.7.0: res=https://repo.scala-sbt.org/scalasbt/sbt-plugin-releases/com.typesafe.play/sbt-plugin/scala_2.12/sbt_1.0/2.7.0/ivys/ivy.xml: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
  [warn]  ::::::::::::::::::::::::::::::::::::::::::::::
  [warn] 
  [warn]  Note: Some unresolved dependencies have extra attributes.  Check that these dependencies exist with the requested attributes.
  [warn]      com.typesafe.play:sbt-plugin:2.7.0 (scalaVersion=2.12, sbtVersion=1.0)
  [warn] 
  [warn]  Note: Unresolved dependencies path:
  [warn]      com.typesafe.play:sbt-plugin:2.7.0 (scalaVersion=2.12, sbtVersion=1.0) (/Users/ramin/Desktop/playground/project/plugins.sbt#L1-2)
  [warn]        +- default:playground-build:0.1.0-SNAPSHOT (scalaVersion=2.12, sbtVersion=1.0)
  </code></pre>
  
  <p>My Scala version is 2.12.4 and I do have sbt 1.0 installed so a bit confused of why this is happening. Any thoughts?</p>