Update lodash to 4.18 to fix security warning and relax with caret range

Ref gruntjs/grunt-legacy-log#35

Ref GHSA-r5fr-rjxr-66jc

Author: Krinkle

package.json

@@ -28,7 +28,7 @@
     "exit": "~0.1.2",
     "getobject": "~1.0.0",
     "hooker": "~0.2.3",
-    "lodash": "~4.17.21",
+    "lodash": "^4.18.0",
     "underscore.string": "~3.3.5",
     "which": "~2.0.2"
   },