업데이트 'README.md'

README.md

@@ -319,10 +319,10 @@ for epoch in range(1, EPOCH+1):
 
 ```
 
-![fation-mnist](./images/output1.jpg)
-![fation-mnist](./images/output2.jpg)
-![fation-mnist](./images/output3.jpg)
-![fation-mnist](./images/output10.jpg)
+![fation-mnist](./images/output1.png)
+![fation-mnist](./images/output2.png)
+![fation-mnist](./images/output3.png)
+![fation-mnist](./images/output10.png)
 
 
 </div>