Update setup.md

Resolutions for merge

Author: tiefling

docs/setup.md

@@ -1,21 +1,29 @@
 In order to use the react eslint plugin do the following...
 
 1. At the root of your project type <code>npm install eslint-plugin-react --save-dev</code>
-2. Check your package.json 'devDependencies' for the following entries (version numbers may vary)...
+2. Check your package.json 'devDependencies' for the following entries (version numbers may vary, but it's important that **the eslint version matches the peerDependency version in eslint-plugin-react**)...
 <pre>
   "devDependencies": {
     "eslint": "^3.19.0",
     "eslint-plugin-react": "^6.10.3"
   }
 </pre>
-3. In your eslint configuration file (.eslint.rc / package.json etc.) add the following under 'esLintConfig'...
+3. If configuring using package.json add the following under 'esLintConfig'...
 <pre>
   "eslintConfig": {
     "plugins": [
       "react"
     ]
    }
 </pre>
+Else, in your eslint configuration file (.eslintrc) add the following...
+<pre>
+  {
+    "plugins": [
+      "react"
+    ]
+  }
+</pre>
 4. Configure the rules you want to use according to the [rules docs](/docs/rules). Here's a sample of some of mine...
 <pre>
   "eslintConfig": {