BCAAS-1111: drop the minimum required version of "yarn" to v1.0.0. I'…

…m aware of a consuming application that requires using an older version of yarn.

package.json

@@ -21,7 +21,7 @@
   "engines": {
     "node": ">=6.9.1",
     "npm": ">=3.10.10",
-    "yarn": ">=1.13.0"
+    "yarn": ">=1.0.0"
   },
   "main": "dist/main.js",
   "types": "dist/main.d.ts",