chore(deps): bump lodash from 4.17.15 to 4.17.21

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.15 to 4.17.21.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](lodash/lodash@4.17.15...4.17.21)

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

package.json

@@ -22,7 +22,7 @@
     "@babel/polyfill": "^7.6.0",
     "chessboardjs": "^0.0.1",
     "jquery": "^3.5.0",
-    "lodash": "^4.17.15",
+    "lodash": "^4.17.21",
     "parcel-bundler": "^1.12.4"
   }
 }