fix: address security warnings for dev dependencies

Author: marionebl

package.json

@@ -84,7 +84,7 @@
   "devDependencies": {
     "docsify-cli": "4.3.0",
     "husky": "1.1.2",
-    "lerna": "3.10.8",
+    "lerna": "3.13.1",
     "lint-staged": "8.1.0",
     "prettier": "1.16.4"
   },
@@ -101,6 +101,7 @@
     "docsify-cli/**/sshpk": "1.14.1",
     "docsify-cli/**/marked": "0.3.9",
     "docsify-cli/**/hoek": "5.0.3",
+    "docsify-cli/**/braces": "2.3.1",
     "deep-extend": "0.5.1",
     "moment": "2.19.3"
   }