title: How to add json4s library to Scala
body: <p>Added to build.sbt file this line:</p>
  
  <pre><code>libraryDependencies += "org.json4s" %% "json4s-jackson" % "3.2.11"
  </code></pre>
  
  <p>And i can't see that the library is added.
  Maybe i need to do some build to this file?</p>