Update postcss dependencies

package.json

@@ -13,7 +13,7 @@
     "build:jsprod":
       "cross-env RENDER_MODE=client webpack -p --config webpack.config.js",
     "build:css":
-      "postcss -c postcss.config.json -o dist/techradar/assets/css/styles.css styles/main.css",
+      "postcss -c postcss.config.js -o dist/techradar/assets/css/styles.css styles/main.css",
     "build:assets": "babel-node ./tasks/assets.js",
     "watch": "babel-node ./tasks/watch.js",
     "clean": "babel-node ./tasks/clean.js",
@@ -23,7 +23,7 @@
   "license": "MIT",
   "dependencies": {
     "async": "2.6.0",
-    "autoprefixer": "6.7.1",
+    "autoprefixer": "7.1.6",
     "babel-cli": "6.26.0",
     "babel-loader": "6.2.10",
     "babel-polyfill": "6.26.0",
@@ -32,7 +32,7 @@
     "babel-preset-stage-0": "6.24.1",
     "classnames": "2.2.5",
     "cross-env": "^4.0.0",
-    "css-mqpacker": "^5.0.1",
+    "css-mqpacker": "^6.0.1",
     "front-matter": "2.3.0",
     "fs-extra": "4.0.2",
     "highlight.js": "9.12.0",
@@ -40,11 +40,11 @@
     "live-server": "1.2.0",
     "marked": "0.3.6",
     "moment": "2.19.2",
-    "postcss-cli": "2.6.0",
+    "postcss-cli": "4.1.1",
     "postcss-css-variables": "0.8.0",
-    "postcss-custom-media": "^5.0.1",
-    "postcss-easy-import": "2.0.0",
-    "postcss-nested": "1.0.0",
+    "postcss-custom-media": "^6.0.0",
+    "postcss-easy-import": "3.0.0",
+    "postcss-nested": "2.1.2",
     "react": "15.4.2",
     "react-dom": "15.4.2",
     "react-redux": "5.0.6",