[eslint config] Make eslint-config-airbnb-base a regular dependency.

Per airbnb#829 (comment)

Author: ljharb

packages/eslint-config-airbnb/README.md

@@ -10,9 +10,9 @@ We export three ESLint configurations for your usage.
 
 ### eslint-config-airbnb
 
-Our default export contains all of our ESLint rules, including ECMAScript 6+ and React. It requires `eslint`, `eslint-config-airbnb-base`, `eslint-plugin-import`, `eslint-plugin-react`, and `eslint-plugin-jsx-a11y`.
+Our default export contains all of our ESLint rules, including ECMAScript 6+ and React. It requires `eslint`, ``eslint-plugin-import`, `eslint-plugin-react`, and `eslint-plugin-jsx-a11y`.
 
-1. `npm install --save-dev eslint-config-airbnb eslint-config-airbnb-base eslint-plugin-import eslint-plugin-react eslint-plugin-jsx-a11y eslint`
+1. `npm install --save-dev eslint-config-airbnb eslint-plugin-import eslint-plugin-react eslint-plugin-jsx-a11y eslint`
 2. add `"extends": "airbnb"` to your .eslintrc
 
 ### eslint-config-airbnb/base

packages/eslint-config-airbnb/package.json

@@ -42,11 +42,13 @@
     "url": "https://github.com/airbnb/javascript/issues"
   },
   "homepage": "https://github.com/airbnb/javascript",
+  "dependencies": {
+    "eslint-config-airbnb-base": "^1.0.2"
+  },
   "devDependencies": {
     "babel-tape-runner": "^1.3.1",
     "eslint": "^2.8.0",
     "eslint-find-rules": "^1.4.0",
-    "eslint-config-airbnb-base": "^1.0.2",
     "eslint-plugin-import": "^1.5.0",
     "eslint-plugin-jsx-a11y": "^1.0.2",
     "eslint-plugin-react": "^5.0.1",
@@ -55,7 +57,6 @@
   },
   "peerDependencies": {
     "eslint": "^2.8.0",
-    "eslint-config-airbnb-base": "^1.0.2",
     "eslint-plugin-jsx-a11y": "^1.0.2",
     "eslint-plugin-import": "^1.5.0",
     "eslint-plugin-react": "^5.0.1"