drop unsupported node versions

Author: stefanpenner

.travis.yml

@@ -2,11 +2,9 @@ sudo: false
 language: node_js
 
 node_js:
-  - "0.12"
-  - "4"
-  - "6"
-  - "7"
   - "8"
+  - "10"
+  - "12"
 
 before_install:
   - npm config --global set spin false

package.json

@@ -18,7 +18,7 @@
     "validator",
     "sourcemap"
   ],
-  "version": "1.1.1",
+  "version": "2.0.0",
   "repository": {
     "type": "git",
     "url": "git://github.com/ben-ng/sourcemap-validator.git"
@@ -38,6 +38,6 @@
   },
   "optionalDependencies": {},
   "engines": {
-    "node": "^0.10 || ^4.5 || 6.* || >= 7.*"
+    "node": "8.* || >= 10.*"
   }
 }