Merge pull request #31 from efokschaner/patch-1

Specify required version of tslib ^2.0.0

Author: Yanyan-Wang

packages/graph/package.json

@@ -67,6 +67,7 @@
     "worker-loader": "^3.0.7"
   },
   "dependencies": {
-    "@antv/util": "^2.0.13"
+    "@antv/util": "^2.0.13",
+    "tslib": "^2.0.0"
   }
 }