title: Slick 3.1.1 not found type 'column'
body: <p>I'm following the Scala Slick <a href="http://slick.lightbend.com/doc/3.1.1/gettingstarted.html#quick-introduction" rel="nofollow">beginner guide</a> trying to create a simple schema, and I can't seem to find the 'column' type when importing the stuff in the beginning of the documentation. </p>
  
  <pre><code>import slick.driver.H2Driver.api._
  import scala.concurrent.ExecutionContext.Implicits.global
  /**
    * Created by chris on 9/7/16.
    */
  class BlockHeaderTable(tag: Tag) extends Table[BlockHeader](tag,"block_headers")  {
  
    def version: column[UInt32]
  
    def previousBlockHash: column[DoubleSha256Digest]
  
    def merkleRootHash: column[DoubleSha256Digest]
  
    def time: column[UInt32]
  
    def nBits: column[UInt32]
  
    def nonce: column[UInt32]
  
  
  }
  </code></pre>
  
  <p>and here is the error I am getting:</p>
  
  <blockquote>
    <p>chris@chris-870Z5E-880Z5E-680Z5E:~/dev/bitcoins-spv-node$ sbt compile 
    [info] Loading project definition from
    /home/chris/dev/bitcoins-spv-node/project [info] Set current project
    to bitcoins-spv-node (in build
    file:/home/chris/dev/bitcoins-spv-node/) [info] Compiling 1 Scala
    source to
    /home/chris/dev/bitcoins-spv-node/target/scala-2.11/classes... [error]
    /home/chris/dev/bitcoins-spv-node/src/main/scala/org/bitcoins/spvnode/models/BlockHeaderTable.scala:14:
    not found: type column [error]   def version: column[UInt32] [error]<br>
    ^ [error]
    /home/chris/dev/bitcoins-spv-node/src/main/scala/org/bitcoins/spvnode/models/BlockHeaderTable.scala:16:
    not found: type column [error]   def previousBlockHash:
    column[DoubleSha256Digest] [error]                          ^ [error]
    /home/chris/dev/bitcoins-spv-node/src/main/scala/org/bitcoins/spvnode/models/BlockHeaderTable.scala:18:
    not found: type column [error]   def merkleRootHash:
    column[DoubleSha256Digest] [error]                       ^ [error]
    /home/chris/dev/bitcoins-spv-node/src/main/scala/org/bitcoins/spvnode/models/BlockHeaderTable.scala:20:
    not found: type column [error]   def time: column[UInt32] [error]<br>
    ^ [error]
    /home/chris/dev/bitcoins-spv-node/src/main/scala/org/bitcoins/spvnode/models/BlockHeaderTable.scala:22:
    not found: type column [error]   def nBits: column[UInt32] [error]<br>
    ^ [error]
    /home/chris/dev/bitcoins-spv-node/src/main/scala/org/bitcoins/spvnode/models/BlockHeaderTable.scala:24:
    not found: type column [error]   def nonce: column[UInt32] [error]<br>
    ^ [error] 6 errors found [error] (compile:compileIncremental)
    Compilation failed</p>
  </blockquote>