Since the website says
libraryDependencies += "net.databinder.dispatch" %% "dispatch-core" % "0.9.5"
The corresponding maven notation for Scala 2.10.x should be:
<dependency>
<groupId>net.databinder.dispatch</groupId>
<artifactId>dispatch-core_2.10</artifactId>
<version>0.9.5</version>
</dependency>
Starting sbt 0.12.0, the Scala version postfix got shortened to _2.10
for Scala 2.10.x and above to take advantage of binary compatibilities between minor releases of Scala.