Failed to compile custom identifier plugin

[zillani]

HelloWorldIdentifierConfig.scala fails to compile.
issue-type: bug
scala version: 2.12.2
JVM: 8
steps to reproduce:

• clone linkerd-examples
• cd plugins
• ./sbt headerClassifier/assembly

Error log:

[error] /root/linkerd-official/linkerd-examples/plugins/header-classifier/src/main/scala/io/buoyant/http/identifiers/HelloWorldIdentifierConfig.scala:10: class HelloWorldIdentifierConfig needs to be abstract, since method newIdentifier in class HttpIdentifierConfig of type (prefix: com.twitter.finagle.Path, baseDtab: () => com.twitter.finagle.Dtab, routerParams: com.twitter.finagle.Stack.Params)io.buoyant.router.RoutingFactory.Identifier[com.twitter.finagle.http.Request] is not defined
[error] class HelloWorldIdentifierConfig extends HttpIdentifierConfig{
[error]       ^
[error] /root/linkerd-official/linkerd-examples/plugins/header-classifier/src/main/scala/io/buoyant/http/identifiers/HelloWorldIdentifierConfig.scala:15: method newIdentifier overrides nothing.
[error] Note: the super classes of class HelloWorldIdentifierConfig contain the following, non final members named newIdentifier:
[error] def newIdentifier(prefix: com.twitter.finagle.Path,baseDtab: () => com.twitter.finagle.Dtab,routerParams: com.twitter.finagle.Stack.Params): io.buoyant.router.RoutingFactory.Identifier[com.twitter.finagle.http.Request]
[error]   override def newIdentifier(prefix: Path, baseDtab: () => Dtab): Identifier[Request] = {
[error]                ^
[error] two errors found

[zillani]

The Issue occurred due to this change,
linkerd/linkerd@6828f31#diff-f1d21d8c3cca2d585850659be8bcc174
Thanks to @dadjeibaah for addressing this!

[dadjeibaah]

Issue fixed by #243