tools: update ESLint to 4.19.1

A few bug fixes result in more stringent linting rules.

PR-URL: https://github.com/nodejs/node/pull/19528
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

tools/node_modules/eslint/lib/rules/complexity.js

@@ -50,7 +50,11 @@ module.exports = {
                     }
                 ]
             }
-        ]
+        ],
+
+        messages: {
+            complex: "{{name}} has a complexity of {{complexity}}."
+        }
     },
 
     create(context) {
@@ -96,7 +100,7 @@ module.exports = {
             if (complexity > THRESHOLD) {
                 context.report({
                     node,
-                    message: "{{name}} has a complexity of {{complexity}}.",
+                    messageId: "complex",
                     data: { name, complexity }
                 });
             }