Merge pull request #14 from hrj/patch-1

Update README.md

Author: retronym

README.md

@@ -2,3 +2,16 @@ scala-parser-combinators [<img src="https://api.travis-ci.org/scala/scala-parser
 ========================
 
 Scala Standard Parser Combinator Library
+
+As of Scala 2.11, this library is a separate jar that can be omitted from Scala projects that do not use Parser Combinators.
+
+## Adding an SBT dependency
+To depend on scala-parser-combinators in SBT, add something like this to your build.sbt:
+
+```
+libraryDependencies += "org.scala-lang.modules" %% "scala-parser-combinators" % "1.0.1"
+```
+
+(Assuming you're using a `scalaVersion` for which a scala-parser-combinators is published. The first 2.11 milestone for which this is true is 2.11.0-M4.)
+
+To support multiple Scala versions, see the example in https://github.com/scala/scala-module-dependency-sample.