Add Node 10 and remove Node 6 from the AppVeyor & Travis config (#306)

Node 10.1 is used on Windows because of this issue: yeoman/yeoman-test#43

.travis.yml

@@ -3,9 +3,9 @@ language: node_js
 addons:
   firefox: "51.0"
 node_js:
-  - "6"
   - "8"
-before_install:
-  - "export DISPLAY=:99.0"
-  - "sh -e /etc/init.d/xvfb start"
+  - "10"
+dist: xenial
+services:
+  - xvfb
 script: npm run coverage:upload

appveyor.yml

@@ -2,8 +2,8 @@
 environment:
   matrix:
   # node.js
-  - nodejs_version: "6"
   - nodejs_version: "8"
+  - nodejs_version: "10.1"
 # Install scripts. (runs after repo cloning)
 install:
   # Get the latest stable version of Node.js or io.js

package.json

@@ -53,7 +53,7 @@
   "devDependencies": {
     "coveralls-send": "0.0.2",
     "donejs": "*",
-    "donejs-cli": "^3.0.0-pre.2",
+    "donejs-cli": "^3.2.0",
     "fs-extra": "^0.30.0",
     "istanbul": "^0.4.2",
     "mkdirp": "^0.5.1",