fix yarn version

Author: Fahd

package.json

@@ -11,7 +11,7 @@
   },
   "engines": {
     "node": ">=8.11.4 <=10.17.0",
-    "yarn": ">=1.12.3 <1.19.1",
+    "yarn": ">=1.12.3 <=1.19.1",
     "npm": "6.11.3"
   },
   "version": "1.0.0-beta.0",