chore: update travis to use node LTS

Author: thomasthiebaud

.travis.yml

@@ -1,6 +1,6 @@
 language: node_js
 node_js:
-  - "8.11.3"
+  - "14"
 
 cache:
   directories:

package.json

@@ -10,7 +10,7 @@
     "postpublish": "pinst --enable",
     "build": "npm run clean && tsc --project .",
     "clean": "rimraf lib/ yarn-error.log npm-debug.log",
-    "lint": "eslint . --ext .ts",
+    "lint": "eslint --ext .ts .",
     "lint:fix": "npm run lint -- --fix",
     "test": "jest",
     "start": "jest --watch"