Update README.md

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albal · May 6, 2017 · 1f7f492 · 1f7f492
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@@ -36,5 +36,6 @@ The file difference3d.xcsg:
 </xcsg>
 ```
 The resulting STL becomes:
+
 ![](https://raw.githubusercontent.com/wiki/arnholm/xcsg/images/difference3d.png)