Updated to latest autoprefixer

package.json

@@ -24,7 +24,8 @@
   ],
   "scripts": {
     "build:node": "babel src --out-dir lib --source-maps inline",
-    "build:css": "rm -rf react-table.css && stylus src/index.styl --use autoprefixer-stylus --compress -o react-table.css",
+    "build:css": "rm -rf react-table.css && stylus src/index.styl --compress -o react-table.css && yarn run css:autoprefix",
+    "css:autoprefix": "postcss --use autoprefixer react-table.css -r",
     "watch": "npm-run-all --parallel watch:*",
     "watch:node": "onchange 'src/**/*.js' -i -- npm run build:node",
     "watch:css": "onchange 'src/**/*.styl' -i -- npm run build:css",
@@ -42,7 +43,7 @@
   },
   "devDependencies": {
     "@kadira/storybook": "^2.35.1",
-    "autoprefixer-stylus": "^0.13.0",
+    "autoprefixer": "^6.7.0",
     "babel-cli": "6.14.0",
     "babel-eslint": "6.1.2",
     "babel-preset-es2015": "6.14.0",
@@ -54,9 +55,9 @@
     "html-loader": "^0.4.4",
     "markdown-loader": "^0.1.7",
     "namor": "^0.3.0",
-    "nib": "^1.1.2",
     "npm-run-all": "^3.1.1",
     "onchange": "^3.0.2",
+    "postcss-cli": "^2.6.0",
     "react": "^15.4.2",
     "react-dom": "^15.4.2",
     "standard": "^8.0.0",