Update dependencies

Author: jonathantneal

package.json

@@ -22,12 +22,12 @@
     "node": ">=4.0.0"
   },
   "dependencies": {
-    "browserslist": "^2.1.4",
-    "postcss": "^6.0.1",
+    "browserslist": "^2.2.2",
+    "postcss": "^6.0.8",
     "postcss-selector-parser": "^2.2.3"
   },
   "devDependencies": {
-    "eslint": "^3.19.0",
+    "eslint": "^4.3.0",
     "eslint-config-dev": "2.0.0",
     "postcss-tape": "2.0.1",
     "pre-commit": "^1.2.2"