[BREAKING] Move ESLint to peer dependencies (#5)

BREACKING CAHNGE: Move ESLint to peer dependencies (fix #3)

You have to `npm install eslint` too.

Author: sapegin

README.md

@@ -37,7 +37,7 @@ Sometimes, we want to write broken JavaScript code into JS CodeBlock for Syntax
 
 Install with [npm](https://www.npmjs.com/):
 
-    npm install textlint-rule-eslint
+    npm install textlint-rule-eslint eslint
 
 ## Usage
 

package.json

@@ -37,11 +37,12 @@
     "babel-preset-jsdoc-to-assert": "^2.0.1",
     "babel-preset-power-assert": "^1.0.0",
     "babel-register": "^6.9.0",
+    "eslint": "^3.0.0",
     "mocha": "^2.5.3",
     "power-assert": "^1.4.1",
     "textlint-tester": "^2.0.0"
   },
-  "dependencies": {
+  "peerDependencies": {
     "eslint": "^3.0.0"
   }
 }