Update dependencies and engine (#13)

- Updated devDependencies
- Update engine to supported versions of nodejs
- Add package-lock.json to .gitignore

Author: YasharF

.gitignore

@@ -1,3 +1,4 @@
 node_modules
 
-*.log
+*.log
+package-lock.json

.travis.yml

@@ -1,6 +1,5 @@
 language: node_js
 node_js:
-  - '0.10'
-  - '0.12'
-  - '4'
-  - '5'
+  - '8'
+  - '10'
+  - '12'

package.json

@@ -13,7 +13,13 @@
     "type": "git",
     "url": "https://github.com/fiznool/passport-oauth2-refresh.git"
   },
-  "keywords": ["passport", "oauth", "oauth2", "auth", "authentication"],
+  "keywords": [
+    "passport",
+    "oauth",
+    "oauth2",
+    "auth",
+    "authentication"
+  ],
   "author": {
     "name": "Tom Spencer",
     "email": "fiznool@gmail.com",
@@ -25,12 +31,12 @@
   },
   "homepage": "https://github.com/fiznool/passport-oauth2-refresh",
   "devDependencies": {
-    "chai": "^4.1.2",
-    "mocha": "^5.2.0",
-    "sinon": "^5.1.0",
+    "chai": "^4.2.0",
+    "mocha": "^6.1.4",
+    "sinon": "^7.3.2",
     "sinon-chai": "^3.1.0"
   },
   "engines": {
-    "node": ">=0.10.0"
+    "node": ">=8.16.0"
   }
 }