Update dependencies

Fix various linting issues exposed by new dependencies
Update readme

package.json

@@ -35,30 +35,30 @@
     "pre-commit": "^1.2.2"
   },
   "dependencies": {
-    "@babel/cli": "^7.2.0",
+    "@babel/cli": "^7.2.3",
     "@babel/core": "^7.2.0",
-    "@babel/preset-env": "^7.2.0",
+    "@babel/preset-env": "^7.2.3",
     "babel-core": "^7.0.0-bridge.0",
-    "babel-jest": "^22.4.4",
-    "cssnano": "^4.1.7",
-    "eslint": "^4.19.1",
-    "eslint-config-airbnb-base": "^12.1.0",
+    "babel-jest": "^23.6.0",
+    "cssnano": "^4.1.8",
+    "eslint": "^5.12.0",
+    "eslint-config-airbnb-base": "^13.1.0",
     "eslint-plugin-import": "^2.14.0",
-    "imagemin": "^6.0.0",
+    "imagemin": "^6.1.0",
     "imagemin-gifsicle": "^6.0.1",
     "imagemin-jpegtran": "^6.0.0",
-    "imagemin-pngquant": "^6.0.0",
-    "jest": "^22.4.4",
+    "imagemin-pngquant": "^7.0.0",
+    "jest": "^23.6.0",
     "npm-run-all": "^4.1.5",
     "postcss-banner": "^3.0.0",
-    "postcss-cli": "^4.1.1",
-    "postcss-import": "^11.0.0",
+    "postcss-cli": "^6.1.1",
+    "postcss-import": "^12.0.1",
     "postcss-normalize": "^7.0.1",
     "postcss-preset-env": "^6.4.0",
-    "rollup": "^0.58.2",
-    "rollup-plugin-babel": "^4.0.3",
-    "rollup-plugin-uglify": "^3.0.0",
-    "stylelint": "^8.4.0",
+    "rollup": "^1.1.0",
+    "rollup-plugin-babel": "^4.3.0",
+    "rollup-plugin-uglify": "^6.0.1",
+    "stylelint": "^9.9.0",
     "stylelint-config-standard": "^18.0.0"
   },
   "pre-commit": [