Update @actions/artifact to version 0.6.0 (#123)

* Update @actions/artifact to version 0.6.0

* update artifact.dep.yml to use version 0.6.0

package.json

@@ -28,7 +28,7 @@
   },
   "homepage": "https://github.com/actions/download-artifact#readme",
   "dependencies": {
-    "@actions/artifact": "^0.5.2",
+    "@actions/artifact": "^0.6.0",
     "@actions/core": "^1.2.6"
   },
   "devDependencies": {