docs(readme): fix writeToDisk example (#342)

ooade · michael-ciniawsky · commit a59b9fdd1177 · 2018-10-19T16:04:21.000+02:00
diff --git a/README.md b/README.md
@@ -218,7 +218,7 @@ of `true` _will_ write the file to disk. eg.
 
 ```js
 {
-  writeToDisk: (filePath) {
+  writeToDisk: (filePath) => {
     return /superman\.css$/.test(filePath);
   }
 }

Original file line number	Diff line number	Diff line change
@@ -218,7 +218,7 @@ of `true` _will_ write the file to disk. eg.
`218`	`218`
`219`	`219`	```js
`220`	`220`	`{`
`221`		`- writeToDisk: (filePath) {`
	`221`	`+ writeToDisk: (filePath) => {`
`222`	`222`	`return /superman\.css$/.test(filePath);`
`223`	`223`	`}`
`224`	`224`	`}`