Updated travis and appveyor configs.

Author: neogeek

.travis.yml

@@ -1,14 +1,13 @@
 language: node_js
 node_js:
-  - "4"
-  - "6"
-  - "7"
-  - "8"
+    - '8'
+    - '10'
+    - '11'
 before_install:
-  - if [[ `npm -v` != 5* ]]; then npm i -g npm@latest; fi
+    - if [[ `npm -v` != 6* ]]; then npm i -g npm@6; fi
 after_success:
-  - npm run coverage
-  - npm run test:flags
-  - npm run test:docs
-  - bash <(curl -s https://codecov.io/bash)
+    - npm run coverage
+    - npm run test:flags
+    - npm run test:docs
+    - bash <(curl -s https://codecov.io/bash)
 sudo: false

appveyor.yml

@@ -1,18 +1,17 @@
 environment:
-  matrix:
-  - nodejs_version: "4"
-  - nodejs_version: "6"
-  - nodejs_version: "8"
-  - nodejs_version: "9"
+    matrix:
+        - nodejs_version: '8'
+        - nodejs_version: '10'
+        - nodejs_version: '11'
 
 install:
-  - ps: Install-Product node $env:nodejs_version
-  - npm i -g npm@latest
-  - npm install
+    - ps: Install-Product node $env:nodejs_version
+    - npm i -g npm@latest
+    - npm install
 
 test_script:
-  - node --version
-  - npm --version
-  - npm test
+    - node --version
+    - npm --version
+    - npm test
 
 build: off