Update yarn and lerna dependencies

package.json

@@ -68,7 +68,7 @@
     "eslint-config-prettier": "^2.9.0",
     "eslint-plugin-prettier": "^2.6.0",
     "husky": "~1.0.0-rc.13",
-    "lerna": "^3.4.1",
+    "lerna": "^3.13.2",
     "lint-staged": "^7.1.0",
     "opn-cli": "^4.0.0",
     "prettier": "^1.11.1",
@@ -76,7 +76,7 @@
     "tslint-config-prettier": "^1.18.0",
     "tslint-plugin-prettier": "^2.0.1",
     "tslint-react": "^4.0.0",
-    "yarn": "1.6.0"
+    "yarn": "1.15.2"
   },
   "husky": {
     "hooks": {