build: use config file for linkinator (#281)

Author: JustinBeckwith

packages/google-cloud-dns/linkinator.config.json

@@ -0,0 +1,7 @@
+{
+  "recurse": true,
+  "skip": [
+    "https://codecov.io/gh/googleapis/",
+    "www.googleapis.com"
+  ]
+}

packages/google-cloud-dns/package.json

@@ -38,7 +38,7 @@
     "fix": "eslint --fix '**/*.js' && gts fix",
     "prepare": "npm run compile",
     "pretest": "npm run compile",
-    "docs-test": "linkinator docs -r --skip www.googleapis.com",
+    "docs-test": "linkinator docs",
     "predocs-test": "npm run docs"
   },
   "dependencies": {
@@ -67,7 +67,7 @@
     "intelli-espower-loader": "^1.0.1",
     "jsdoc": "^3.6.2",
     "jsdoc-baseline": "^0.1.0",
-    "linkinator": "^1.1.2",
+    "linkinator": "^1.5.0",
     "mocha": "^6.0.0",
     "nyc": "^14.0.0",
     "power-assert": "^1.5.0",