Update deps and bump Node.js requirement (#164)

Author: TimothyGu

.eslintrc.json

@@ -2,10 +2,11 @@
   "root": true,
   "env": {
     "node": true,
-    "es6": true
+    "es6": true,
+    "es2017": true
   },
   "parserOptions": {
-    "ecmaVersion": 8
+    "ecmaVersion": 2019
   },
   "rules": {
     // Possible errors

.travis.yml

@@ -1,6 +1,6 @@
 language: node_js
 node_js:
-  - "8"
+  - "10"
   - stable
 
 install:

package.json

@@ -11,8 +11,8 @@
     "webidl2": "^23.10.1"
   },
   "devDependencies": {
-    "eslint": "^6.6.0",
-    "jest": "^24.9.0"
+    "eslint": "^6.8.0",
+    "jest": "^25.1.0"
   },
   "scripts": {
     "test": "jest",
@@ -26,7 +26,7 @@
     ]
   },
   "engines": {
-    "node": ">=8"
+    "node": ">=10"
   },
   "author": "Sebastian Mayr <npm@smayr.name>",
   "license": "MIT"