refactor(ng-lib): change cleanDups to private (#324)

change cleanDups to private as it's an implementation detail

Author: geromegrignon

projects/scullyio/ng-lib/src/lib/route-service/scully-routes.service.ts

@@ -68,7 +68,7 @@ export class ScullyRoutesService {
     );
   }
 
-  cleanDups(routes: ScullyRoute[]) {
+  private cleanDups(routes: ScullyRoute[]) {
     const m = new Map<string, ScullyRoute>();
     routes.forEach(r => m.set(r.sourceFile || r.route, r));
     return [...m.values()];