fix(deps): update dependency lodash to v4.17.21 [security]

Author: renovate-bot

exercices-v2/package.json

@@ -9,7 +9,7 @@
     "@types/node": "^7.0.13",
     "fetch-mock": "^5.10.0",
     "isomorphic-fetch": "^2.2.1",
-    "lodash": "4.17.4",
+    "lodash": "4.17.21",
     "mobx": "^3.1.9",
     "ts-node": "3.0.2",
     "typescript": "2.2.2",

exercices/package.json

@@ -11,6 +11,6 @@
   "dependencies": {
     "babel-cli": "^6.1.2",
     "babel-preset-es2015": "^6.1.2",
-    "lodash": "^3.10.1"
+    "lodash": "^4.0.0"
   }
 }