Add type checking to ci (#626)

* Add type checking to ci

* Update @types/node to version 12

We are using node 12 on ci

.travis.yml

@@ -11,4 +11,5 @@ install:
   - yarn
 
 script:
+  - tsc --noEmit
   - xvfb-run --server-args="-screen 0 1920x1080x24" npm test

package.json

@@ -42,7 +42,7 @@
     "@types/inquirer": "0.0.43",
     "@types/jsdom": "^16.2.12",
     "@types/mocha": "^5.2.5",
-    "@types/node": "^10.11.7",
+    "@types/node": "^12.20.16",
     "@types/puppeteer": "^5.4.3",
     "chai": "^4.2.0",
     "cross-env": "^5.2.0",

yarn.lock

@@ -65,10 +65,10 @@
   resolved "https://registry.yarnpkg.com/@types/node/-/node-14.14.2.tgz#d25295f9e4ca5989a2c610754dc02a9721235eeb"
   integrity sha512-jeYJU2kl7hL9U5xuI/BhKPZ4vqGM/OmK6whiFAXVhlstzZhVamWhDSmHyGLIp+RVyuF9/d0dqr2P85aFj4BvJg==
 
-"@types/node@^10.11.7":
-  version "10.17.42"
-  resolved "https://registry.yarnpkg.com/@types/node/-/node-10.17.42.tgz#90dd71b26fe4f4e2929df6b07e72ef2e9648a173"
-  integrity sha512-HElxYF7C/MSkuvlaHB2c+82zhXiuO49Cq056Dol8AQuTph7oJtduo2n6J8rFa+YhJyNgQ/Lm20ZaxqD0vxU0+Q==
+"@types/node@^12.20.16":
+  version "12.20.16"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-12.20.16.tgz#1acf34f6456208f495dac0434dd540488d17f991"
+  integrity sha512-6CLxw83vQf6DKqXxMPwl8qpF8I7THFZuIwLt4TnNsumxkp1VsRZWT8txQxncT/Rl2UojTsFzWgDG4FRMwafrlA==
 
 "@types/parse5@*":
   version "6.0.0"