Bump lodash from 4.17.4 to 4.17.19 in /web

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.4 to 4.17.19.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](lodash/lodash@4.17.4...4.17.19)

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

web/package.json

@@ -77,7 +77,7 @@
         "jsdom": "^9.4.0",
         "less": "^2.7.1",
         "less-loader": "^2.2.3",
-        "lodash": "^4.17.2",
+        "lodash": "^4.17.19",
         "material-ui": "^0.16.4",
         "mime": "^1.3.4",
         "mocha": "^3.1.2",