ci: greenkeeper ignore eslint except @kevinoid

Pull requests for eslint, eslint-config, and eslint-plugin updates are
only actionable if @kevinoid/eslint-config is updated at the same time
(since it lists those packages as peerDependencies).  Therefore,
Greenkeeper shouldn't monitor these packages.

Signed-off-by: Kevin Locke <[email protected]>

Author: kevinoid

package.json

@@ -64,6 +64,16 @@
     "node": ">=8.3",
     "npm": ">=1.3.7"
   },
+  "greenkeeper": {
+    "ignore": [
+      "eslint",
+      "eslint-config-airbnb-base",
+      "eslint-plugin-import",
+      "eslint-plugin-node",
+      "eslint-plugin-promise",
+      "eslint-plugin-unicorn"
+    ]
+  },
   "mocha": {
     "checkLeaks": true,
     "exit": false