Update version number

Author: Philippus

README.md

@@ -24,7 +24,7 @@ sbt.version = 1.1.1
 
 Add the plugin in project/plugins.sbt:
 ```scala
-addSbtPlugin("org.scoverage" % "sbt-scoverage" % "1.5.1")
+addSbtPlugin("org.scoverage" % "sbt-scoverage" % "1.6.0")
 ```
 
 Run the tests with enabled coverage: