modify engines version

package.json

@@ -220,7 +220,7 @@
   "engines": {
     "node": ">=8.11.1 <11",
     "npm": ">=5.6.0 <7",
-    "yarn": ">=1.5.1 <1.13"
+    "yarn": ">=1.5.1 <2"
   },
   "config": {
     "blanket": {