build: use config file for linkinator (#655)

Author: JustinBeckwith

handwritten/spanner/linkinator.config.json

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

handwritten/spanner/package.json

@@ -48,7 +48,7 @@
     "proto:spanner": "mkdir -p proto && pbjs -t static-module -w commonjs -p node_modules/google-proto-files google/spanner/v1/spanner.proto | pbts -o proto/spanner.d.ts -",
     "proto:spanner_instance_admin": "pbjs -t static-module -w commonjs -p node_modules/google-proto-files google/spanner/admin/instance/v1/spanner_instance_admin.proto | pbts -o proto/spanner_instance_admin.d.ts -",
     "proto:spanner_database_admin": "pbjs -t static-module -w commonjs -p node_modules/google-proto-files google/spanner/admin/database/v1/spanner_database_admin.proto | pbts -o proto/spanner_database_admin.d.ts -",
-    "docs-test": "linkinator docs -r --skip www.googleapis.com",
+    "docs-test": "linkinator docs",
     "predocs-test": "npm run docs"
   },
   "dependencies": {
@@ -102,7 +102,7 @@
     "intelli-espower-loader": "^1.0.1",
     "jsdoc": "^3.6.2",
     "jsdoc-baseline": "^0.1.0",
-    "linkinator": "^1.1.2",
+    "linkinator": "^1.5.0",
     "lodash.random": "^3.2.0",
     "mocha": "^6.0.0",
     "mv": "^2.1.1",