Bump lodash in /test/fixtures-init/existing-with-package-json

Bumps [lodash](https://github.com/lodash/lodash) from 3.10.1 to 4.17.15.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](lodash/lodash@3.10.1...4.17.15)

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

test/fixtures-init/existing-with-package-json/package.json

@@ -18,7 +18,7 @@
     "js-yaml": "3.4.6",
     "jshint": "2.8.0",
     "init-package-json": "1.9.3",
-    "lodash": "3.10.1",
+    "lodash": "4.17.15",
     "parameters": "0.1.5",
     "semver": "5.1.0",
     "strip-bom": "2.0.0",