Reverse default value.

Author: reklatsmasters

Diff for: README.md

@@ -121,11 +121,11 @@ For the list of every available exclusion rule set, please see the [readme of es
       }]
       ```
 
-    - `withNodeModules`: Prettier ignores files located in `node_modules` directories. To opt-out from this behavior set `true`, (default: `false`). May be useful if you are using multiple `node_modules` directories, example to avoid many `../..` sequences.
+    - `withNodeModules`: Prettier ignores files located in `node_modules` directories. To opt-out from this behavior set `false`, (default: `true`). May be useful if you are using multiple `node_modules` directories, example to avoid many `../..` sequences.
 
       ```json
       "prettier/prettier": ["error", {}, {
-        "withNodeModules": true
+        "withNodeModules": false
       }]
       ```
 

Diff for: eslint-plugin-prettier.js

@@ -142,7 +142,7 @@ module.exports = {
         const usePrettierrc =
           !context.options[1] || context.options[1].usePrettierrc !== false;
         const withNodeModules =
-          context.options[1] && context.options[1].withNodeModules !== false;
+          !context.options[1] || context.options[1].withNodeModules !== false;
         const sourceCode = context.getSourceCode();
         const filepath = context.getFilename();
         const source = sourceCode.text;