Update Part 3.1. Convolution.ipynb

Author: 코딩하는펭귄

Part 3. Convolutional Neural Network/Part 3.1. Convolution.ipynb

@@ -362,7 +362,7 @@
         "colab_type": "text"
       },
       "source": [
-        "![13-7.png](./img/13-7.png)\n"
+        "![13-7.png](./img/13-7.PNG)\n"
       ]
     },
     {
@@ -733,4 +733,4 @@
       ]
     }
   ]
-}
+}