Added documentation for options PackagePrivate and ConstantValue.

README.markdown

@@ -162,6 +162,43 @@ val builtAtString: String = "2015-07-30 03:30:16.849-0700"
 val builtAtMillis: Long = 1438227016849L
 ```
 
+### BuildInfoOption.PackagePrivate
+Set the package using `buildInfoPackage` and use the option `BuildInfoOption.PackagePrivate`
+
+```scala
+buildInfoPackage := "hello"
+buildInfoOptions += BuildInfoOption.PackagePrivate
+```
+
+to make the generated `BuildInfo` object package private:
+
+```scala
+/** This object was generated by sbt-buildinfo. */
+private[hello] case object BuildInfo {  
+  ...
+}
+```
+
+### BuildInfoOption.ConstantValue
+
+Add the following option
+
+```scala
+buildInfoOptions += BuildInfoOption.ConstantValue
+```
+to have all vals in the `BuildInfo` object declared `final` and without an explicit type annotation:
+
+```scala
+/** This object was generated by sbt-buildinfo. */
+case object BuildInfo {
+  /** The value is "helloworld". */
+  final val name = "helloworld"
+  ...
+}
+```
+
+This is particular useful if the values must be constants – e.g., if you need to assign them to annotation arguments.
+
 License
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