Bump lodash from 3.10.1 to 4.17.21

Bumps [lodash](https://github.com/lodash/lodash) from 3.10.1 to 4.17.21.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](lodash/lodash@3.10.1...4.17.21)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -18,7 +18,7 @@
   "dependencies": {
     "agentkeepalive": "^3.3.0",
     "bluebird": "^3.3.5",
-    "lodash": "^3.9.3",
+    "lodash": "^4.17.21",
     "request": "^2.73.0"
   },
   "devDependencies": {