Fix readme demo pictures

Author: friendlymatthew

README.md

@@ -1,9 +1,9 @@
 # iris
 
 <p align="center">
-    <img src="tests/vangogh-gaussian-blur.png" alt="Van Gogh Blur" width="220"/>
-    <img src="tests/vangogh-normal.png" alt="Van Gogh Normal" width="220"/>
-    <img src="tests/vangogh-sharpen.png" alt="Van Gogh Sharpen" width="220"/>
+    <img src="obama-luma-gaussian-blur.png" width="250"/>
+    <img src="obama-normal.png" width="250"/>
+    <img src="obama-line-detection.png" width="250"/>
 </p>
 <br>
 
@@ -81,4 +81,4 @@ https://medium.com/@evanwallace/easy-scalable-text-rendering-on-the-gpu-c3f4d782
 
 ### Miscellaneous
 
-https://www.joelonsoftware.com/2003/10/08/the-absolute-minimum-every-software-developer-absolutely-positively-must-know-about-unicode-and-character-sets-no-excuses/<br>
+https://www.joelonsoftware.com/2003/10/08/the-absolute-minimum-every-software-developer-absolutely-positively-must-know-about-unicode-and-character-sets-no-excuses/<br>