Updated minimum node to 8 and added 12 support

Author: Rowan Wookey

.travis.yml

@@ -1,9 +1,9 @@
 language: "node_js"
 node_js:
-  - "6"
   - "8"
   - "10"
   - "11"
+  - "12"
 
 before_install:
   - "npm install [email protected] -g"

package.json

@@ -32,7 +32,7 @@
     }
   ],
   "main": "./lib",
-  "browserslist": ["node >= 6.0.0"],
+  "browserslist": ["node >= 8.0.0"],
   "dependencies": {
     "@passport-next/passport-strategy": "1.x.x"
   },
@@ -60,7 +60,7 @@
     "typescript": "^3.4.5"
   },
   "engines": {
-    "node": ">=6.0.0"
+    "node": ">=8.0.0"
   },
   "scripts": {
     "spec": "mocha --reporter spec --require test/bootstrap/node test/*.test.js test/**/*.test.js",