chore: add cucumber.js to list of files to lint and /docs to .gitignore (#327)

Signed-off-by: Lance Ball <lball@redhat.com>

.gitignore

@@ -12,6 +12,7 @@ index.js
 /browser
 /bundles
 /dist
+/docs
 
 # Runtime data
 pids

package.json

@@ -6,7 +6,7 @@
   "scripts": {
     "watch": "tsc --project tsconfig.json --watch",
     "build": "tsc --project tsconfig.json && tsc --project tsconfig.browser.json && webpack",
-    "lint": "eslint 'src/**/*.{js,ts}' 'test/**/*.{js,ts}'",
+    "lint": "eslint 'src/**/*.{js,ts}' 'test/**/*.{js,ts}' cucumber.js",
     "lint:fix": "eslint 'src/**/*.{js,ts}' 'test/**/*.{js,ts}' --fix",
     "pretest": "npm run lint && npm run conformance",
     "test": "mocha --require ts-node/register ./test/integration/**/*.ts",