put nsp back, fix travis

Author: Coobaha

.travis.yml

@@ -1,18 +1,8 @@
 language: node_js
 node_js:
-  - "5"
+  - "8"
   - "6"
-before_install:
-  # Repo for newer Node.js versions
-  - curl -sL https://deb.nodesource.com/setup_6.x | sudo -E bash -
-  # Repo for Yarn
-  - sudo apt-key adv --keyserver pgp.mit.edu --recv D101F7899D41F3C3
-  - echo "deb http://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
-  - sudo apt-get update -qq
-  - sudo apt-get install -y -qq yarn
-cache:
-  directories:
-  - $HOME/.yarn-cache
+cache: yarn
 install:
   - yarn
 script:

package.json

@@ -21,15 +21,15 @@
     "url": "https://github.com/coobaha/postcss-variables-loader"
   },
   "scripts": {
-    "audit": "nsp check package",
+    "audit": "nsp check",
     "build": "babel -d ./ ./src",
     "check": "npm run audit",
     "coverage": "nyc --reporter=lcov --reporter=text --reporter=html npm test",
     "coveralls": "npm run coverage && cat ./coverage/lcov.info | coveralls && rm -rf ./coverage",
     "lint": "eslint src test",
     "test": "ava --require babel-core/register -T 7s test/index.js",
     "validate": "npm run lint && npm test",
-    "prepare": "npm run build && npm run validate"
+    "prepare": "npm run build && npm run validate && nsp check"
   },
   "author": {
     "name": "Alexander Ryzhikov",