Update README.md

Author: ray-cast

README.md

@@ -6,6 +6,7 @@ Spectrum is an image effect for MikuMikuDance, this is a very fast technique to
 ![Alt](https://raw.githubusercontent.com/MikuMikuShaders/Spectrum/master/Screenshots/preview2.jpg)
 ![Alt](https://raw.githubusercontent.com/MikuMikuShaders/Spectrum/master/Screenshots/preview3.jpg)
 ![Alt](https://raw.githubusercontent.com/MikuMikuShaders/Spectrum/master/Screenshots/preview4.jpg)
+![Alt](https://raw.githubusercontent.com/MikuMikuShaders/Spectrum/master/Screenshots/preview5.jpg)
 
 Requirements:
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