CI testing on Node.js versions 8 & 10 (#371)

* .travis.yml cleanup

* appveyor.yml & .travis.yml add Node.js versions 8 & 10

.travis.yml

@@ -1,25 +1,33 @@
 language: objective-c
 osx_image: xcode9.2
 sudo: false
+
 env:
   matrix:
   - TRAVIS_NODE_VERSION: '4.8.7'
   - TRAVIS_NODE_VERSION: '6.13'
+  - TRAVIS_NODE_VERSION: '8'
+  - TRAVIS_NODE_VERSION: '10'
+
 before_install:
 - npm cache clean -f
 - rm -rf ~/.nvm && git clone https://github.com/creationix/nvm.git ~/.nvm && (cd ~/.nvm
   && git checkout `git describe --abbrev=0 --tags`) && source ~/.nvm/nvm.sh && nvm
   install $TRAVIS_NODE_VERSION
 - node --version
+
 install:
 - npm install
 - npm install ios-deploy
 - npm install -g codecov
+
 script:
     - npm run unit-tests
     - npm run e2e-tests
     - open -b com.apple.iphonesimulator    
     - npm run objc-tests
     - npm run cover
     - npm run eslint
-after_script: codecov
+
+after_script:
+    - codecov

appveyor.yml

@@ -2,6 +2,8 @@ environment:
   matrix:
   - nodejs_version: "4"
   - nodejs_version: "6"
+  - nodejs_version: "8"
+  - nodejs_version: "10"
 
 install:
   - ps: Install-Product node $env:nodejs_version