Updating the `package.json` dev dependencies.

[jason-fox]

Updating the package.json dev dependencies.

   "devDependencies": {
-    "eslint": "~5.16.0",
-    "eslint-config-tamia": "~6.2.1",
-    "eslint-plugin-prettier": "~3.1.0",
-    "prettier": "~1.14.2",
-    "mocha": "6.1.4",
-    "mongodb": "3.2.3",
+    "eslint": "~7.5.0",
+    "eslint-config-tamia": "~7.2.5",
+    "eslint-plugin-prettier": "~3.1.4",
+    "husky": "~4.2.5",
+    "lint-staged": "~10.2.11",
+    "mocha": "8.0.1",
+    "mongodb": "3.5.9",
+    "nock": "13.0.3",
+    "nyc": "~15.1.0",
+    "prettier": "~2.0.5",
     "should": "13.2.3",
-    "husky": "~1.1.0",
-    "istanbul": "0.4.5",
-    "lint-staged": "~7.3.0",
     "timekeeper": "2.2.0",
-    "nock": "10.0.6",
     "watch": "~1.0.2"
   },

[jason-fox]

Related: https://github.com/telefonicaid/iotagent-ul/pull/434