README.md: remove "prevent prevent" repetition

vitorgalvao · jonathantneal · commit 3b82306f47fe · 2018-09-05T16:30:12.000-04:00
diff --git a/README.md b/README.md
@@ -119,7 +119,7 @@ html {
 }
 ```
 
-##### Words break to prevent prevent overflow
+##### Words break to prevent overflow
 
 ```css
 html {

Original file line number	Diff line number	Diff line change
`@@ -119,7 +119,7 @@ html {`
`119`	`119`	`}`
`120`	`120`	```
`121`	`121`
`122`		`-##### Words break to prevent prevent overflow`
	`122`	`+##### Words break to prevent overflow`
`123`	`123`
`124`	`124`	```css
`125`	`125`	`html {`