chore: downgrade version of lerna

See: lerna/lerna#210

Author: ulivz

package.json

@@ -37,7 +37,7 @@
     "eslint": "^4.19.1",
     "eslint-plugin-jest": "^21.15.1",
     "eslint-plugin-vue-libs": "^3.0.0",
-    "lerna": "^3.14.1",
+    "lerna": "3.13.4",
     "lint-staged": "^8.1.5",
     "minimist": "^1.2.0",
     "yorkie": "^2.0.0",