Bump deps, required node version and ci (#137)

.travis.yml

@@ -2,5 +2,5 @@ sudo: false
 language: node_js
 node_js:
   - '8'
-  - '6'
-  - '4'
+  - '10'
+  - '12'

appveyor.yml

@@ -7,13 +7,13 @@ version: "{build}"
 # What combinations to test
 environment:
   matrix:
-    - nodejs_version: "4"
+    - nodejs_version: "8"
       platform: x86
-    - nodejs_version: "6"
+    - nodejs_version: "10"
       platform: x86
-    - nodejs_version: "6"
+    - nodejs_version: "12"
       platform: x64
-    - nodejs_version: "8"
+    - nodejs_version: "12"
       platform: x86
 
 install:

package.json

@@ -6,7 +6,7 @@
   "repository": "gruntjs/grunt-cli",
   "license": "MIT",
   "engines": {
-    "node": ">=4"
+    "node": ">=8"
   },
   "scripts": {
     "test": "node bin/grunt test"
@@ -15,15 +15,15 @@
     "grunt": "bin/grunt"
   },
   "dependencies": {
-    "grunt-known-options": "~1.1.0",
+    "grunt-known-options": "~1.1.1",
     "interpret": "~1.1.0",
     "liftoff": "~2.5.0",
     "nopt": "~4.0.1",
-    "v8flags": "~3.1.1"
+    "v8flags": "~3.2.0"
   },
   "devDependencies": {
-    "grunt": "~1.0.2",
-    "grunt-contrib-jshint": "~1.1.0"
+    "grunt": "~1.3.0",
+    "grunt-contrib-jshint": "~2.1.0"
   },
   "files": [
     "bin",