fix: the manifest paths should not include the root

Author: hansl

lib/broccoli/service-worker-manifest.js

@@ -57,7 +57,7 @@ class DiffingSWManifest extends Plugin {
     var files = Object.keys(manifest).sort();
     var bundleHash = this.computeBundleHash(files, manifest);
     var contents = files
-      .map((file) => `# sw.file.hash: ${this.computeFileHash(file)}\n${path.sep}${file}`)
+      .map((file) => `# sw.file.hash: ${this.computeFileHash(file)}\n${path.sep}${path.relative(this.inputPaths[0], file)}`)
       .join('\n');
     return `CACHE MANIFEST
 # sw.bundle: ng-cli