chore(deps): update peerDependencies

Author: Ryan A. Johnson

package.json

@@ -14,7 +14,7 @@
     "dist/"
   ],
   "peerDependencies": {
-    "@webcomponents/webcomponentsjs": "*"
+    "@webcomponents/webcomponentsjs": "^1.2.4 || ^2.0.4"
   },
   "devDependencies": {
     "babel-core": "^6.26.0",