Updated Scala README with information on internalDomains parameter

Author: fblundun

README.md

@@ -61,6 +61,28 @@ for (r <- Parser.parse(refererUrl, pageUrl)) {
 }
 ```
 
+You can also provide a list of domains which should be considered internal:
+
+```scala
+val refererUrl = "http://www.subdomain1.snowplowanalytics.com"
+val pageUrl = "http://www.snowplowanalytics.com"
+val internalDomains = List(
+  "www.subdomain1.snowplowanalytics.com", "www.subdomain2.snowplowanalytics.com"
+)
+
+import com.snowplowanalytics.refererparser.scala.Parser
+
+for (r <- Parser.parse(refererUrl, pageUrl, internalDomains)) {
+  println(r.medium)         // => "internal"
+  for (s <- r.source) {
+    println(s)              // => null
+  }
+  for (t <- r.term) {
+    println(t)              // => null
+  }
+}
+```
+
 For more information, please see the Java/Scala [README] [java-scala-readme].
 
 ## Usage: Ruby

java-scala/README.md

@@ -87,6 +87,28 @@ for (r <- Parser.parse(refererUrl, pageUrl)) {
 }
 ```
 
+You can also provide a list of domains which should be considered internal:
+
+```scala
+val refererUrl = "http://www.subdomain1.snowplowanalytics.com"
+val pageUrl = "http://www.snowplowanalytics.com"
+val internalDomains = List(
+  "www.subdomain1.snowplowanalytics.com", "www.subdomain2.snowplowanalytics.com"
+)
+
+import com.snowplowanalytics.refererparser.scala.Parser
+
+for (r <- Parser.parse(refererUrl, pageUrl, internalDomains)) {
+  println(r.medium)         // => "internal"
+  for (s <- r.source) {
+    println(s)              // => null
+  }
+  for (t <- r.term) {
+    println(t)              // => null
+  }
+}
+```
+
 ### Installation
 
 Add this to your SBT config: