update package to live in Runtime, add dependency

package.json

@@ -3,5 +3,8 @@
   "displayName": "Unity Tests Metadata Manager",
   "version": "0.1.0-preview",
   "unity": "2019.4",
-  "description": "Used to manage custom metadata for Unity performance tests."
+  "description": "Used to manage custom metadata for Unity performance tests.",
+  "dependencies": {
+    "com.unity.test.performance.runtimesettings": "0.2.0-preview"
+  }
 }