[eslint config] [base] [patch] newline-per-chained-call: bump the limit to 4.

Specifically, this is to allow this frequent pattern:
```js
$.ajax({
  …
}).done(() => {
  …
}).fail(() => {
  …
}).always(() => {
  …
});
```

packages/eslint-config-airbnb-base/rules/style.js

@@ -119,7 +119,7 @@ module.exports = {
     // enforces new line after each method call in the chain to make it
     // more readable and easy to maintain
     // http://eslint.org/docs/rules/newline-per-chained-call
-    'newline-per-chained-call': [2, { ignoreChainWithDepth: 3 }],
+    'newline-per-chained-call': [2, { ignoreChainWithDepth: 4 }],
 
     // disallow use of the Array constructor
     'no-array-constructor': 2,