Bump lodash from 4.17.11 to 4.17.21

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.11 to 4.17.21.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](lodash/lodash@4.17.11...4.17.21)

---
updated-dependencies:
- dependency-name: lodash
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package.json

@@ -11,7 +11,7 @@
     "chalk": "2.4.1",
     "commander": "2.9.0",
     "debug": "4.1.0",
-    "lodash": "4.17.11",
+    "lodash": "4.17.21",
     "mkdirp": "0.5.1",
     "ncp": "2.0.0",
     "prompt": "1.0.0",