Update dependency lodash to v4.17.21 [SECURITY]

Author: renovate[bot]

package.json

@@ -17,7 +17,7 @@
     "graph-paths": "latest",
     "intelligo": "1.3.0",
     "languagemodel": "latest",
-    "lodash": "4.17.15",
+    "lodash": "4.17.21",
     "sprintf": "0.1.5",
     "svm": "0.1.1",
     "temp": "0.9.1",