Bump lodash from 4.17.4 to 4.17.21

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.4 to 4.17.21.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](lodash/lodash@4.17.4...4.17.21)

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

Author: dependabot[bot]

package.json

@@ -15,7 +15,7 @@
     "apeman-react-clock": "3.0.3",
     "babel-polyfill": "6.23.0",
     "bowser": "1.6.0",
-    "lodash": "4.17.4",
+    "lodash": "4.17.21",
     "prop-types": "15.5.8",
     "rc-progress": "2.0.6",
     "react": "15.5.4",