trimmed excess spacing

Author: EDDYMENS

README.md

@@ -440,10 +440,8 @@ class Sabberworm\CSS\CSSList\Document#4 (2) {
 }
 
 ```
-
 </details>
 
-
 #### Output (`render()`)
 
 ```css
@@ -615,7 +613,6 @@ class Sabberworm\CSS\CSSList\Document#4 (2) {
 ```
 </details>
 
-
 #### Output (`render()`)
 
 ```css