router: navigateToRoute return signature change - no longer a Promise?

• Overview of the Issue: router navigateToRoute() previously has a return signature type of Promise<PipelineResult | boolean>, then NavigationResult and most recently boolean (version 1.7.1).
• Motivation or Use Case:
  • Upgrading from earlier versions to latest results in build failure in projects enforcing tslint rule “await-promise”.
  • Code relying upon navigateToRoute as an awaitable function require refactoring
• Library Name and Version(s): aurelia-router, router.ts version 1.7.1 (current)
• Browsers and Operating System: N/A (build issue)
• Reproduce the Error: Build an application with lines below using aurelia-router version 1.7.1 and tslint “await-promise” rule turned on
• Related Issues: None found
• Suggest a Fix: Revert return signature change, or explain reason for change to return type boolean.

https://github.com/aurelia/router/blob/893b768f01aea842ee57db4222e66aa572f24404/dist/aurelia-router.d.ts#L300