Update app.py

app.py

@@ -8,7 +8,7 @@ class SkinCancer :
     def __init__ (self):
         self.model = self.load_model()
 
-    def build_model () :
+    def build_model (self) :
         model = Sequential()
         model.add(Conv2D(filters = 128, kernel_size = (4,4), input_shape = (32, 32, 3), activation = 'relu'))
         model.add(MaxPool2D(pool_size = (4,4)))