Update README.md with codeFrame option (babel#448)

Author: Couto

README.md

@@ -78,6 +78,7 @@ Check out the [ESLint docs](http://eslint.org/docs/rules/) for all possible rule
 
 `sourceType` can be set to `'module'`(default) or `'script'` if your code isn't using ECMAScript modules.
 `allowImportExportEverywhere` can be set to true to allow import and export declarations to appear anywhere a statement is allowed if your build environment supports that. By default, import and export declarations can only appear at a program's top level.
+`codeFrame` can be set to false to disable the code frame in the reporter. This is useful since some eslint formatters don't play well with it.
 
 **.eslintrc**
 
@@ -86,7 +87,8 @@ Check out the [ESLint docs](http://eslint.org/docs/rules/) for all possible rule
   "parser": "babel-eslint",
   "parserOptions": {
     "sourceType": "module",
-    "allowImportExportEverywhere": false
+    "allowImportExportEverywhere": false,
+    "codeFrame": false
   }
 }
 ```