Add Travis CI to check linting

.travis.yml

@@ -0,0 +1,15 @@
+language: node_js
+node_js:
+  - "10"
+sudo: required
+before_install:
+  - sudo apt-key adv --fetch-keys http://dl.yarnpkg.com/debian/pubkey.gpg
+  - echo "deb http://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
+  - sudo apt-get update -qq
+  - sudo apt-get install -y -qq yarn=1.15.2-1
+cache:
+  yarn: true
+install:
+  - yarn install
+script:
+  - yarn lint

package.json

@@ -11,7 +11,8 @@
     "overwrite-lib": "cpx 'temp/**/*.*' lib --clean",
     "build-lib": "rimraf temp && NODE_ENV=production babel src/lib --out-dir temp --copy-files --ignore __tests__,spec.js,test.js,__snapshots__ && cpx package.json ./temp/ && npm run overwrite-lib",
     "build": "rimraf dist && NODE_ENV=production babel src/lib --out-dir dist --copy-files --ignore __tests__,spec.js,test.js,__snapshots__ && cpx package.json ./dist/",
-    "publish-dist": "yarn build && npm publish dist --access public"
+    "publish-dist": "yarn build && npm publish dist --access public",
+    "lint": "yarn run standard"
   },
   "devDependencies": {
     "@babel/cli": "^7.4.3",