[guide] fix “long lines” example to not include strings.

Fixes airbnb#1027.

Author: ljharb

README.md

@@ -2142,20 +2142,24 @@ Other Style Guides
     ```
 
   <a name="whitespace--max-len"></a><a name="18.12"></a>
-  - [18.12](#whitespace--max-len) Avoid having lines of code that are longer than 100 characters (including whitespace). eslint: [`max-len`](http://eslint.org/docs/rules/max-len.html) jscs: [`maximumLineLength`](http://jscs.info/rule/maximumLineLength)
+  - [18.12](#whitespace--max-len) Avoid having lines of code that are longer than 100 characters (including whitespace). Note: per [above](#strings--line-length), long strings are exempt from this rule, and should not be broken up. eslint: [`max-len`](http://eslint.org/docs/rules/max-len.html) jscs: [`maximumLineLength`](http://jscs.info/rule/maximumLineLength)
 
     > Why? This ensures readability and maintainability.
 
     ```javascript
     // bad
-    const foo = 'Whatever national crop flips the window. The cartoon reverts within the screw. Whatever wizard constrains a helpful ally. The counterpart ascends!';
+    const foo = jsonData && jsonData.foo && jsonData.foo.bar && jsonData.foo.bar.baz && jsonData.foo.bar.baz.quux && jsonData.foo.bar.baz.quux.xyzzy;
 
     // bad
     $.ajax({ method: 'POST', url: 'https://auth0.com/', data: { name: 'John' } }).done(() => console.log('Congratulations!')).fail(() => console.log('You have failed this city.'));
 
     // good
-    const foo = 'Whatever national crop flips the window. The cartoon reverts within the screw. ' +
-      'Whatever wizard constrains a helpful ally. The counterpart ascends!';
+    const foo = jsonData
+      && jsonData.foo
+      && jsonData.foo.bar
+      && jsonData.foo.bar.baz
+      && jsonData.foo.bar.baz.quux
+      && jsonData.foo.bar.baz.quux.xyzzy;
 
     // good
     $.ajax({