pep 8 update (#48)

Week 3 day 1 Ex1 The neuron. Python conventions. #32

piscine/week03/day01/ex01/README.md

@@ -40,7 +40,7 @@ x1 = 2 , x2 = 3 , w1 = 0, w2= 1, b = 4
         self.weights_2 = weight2
         self.bias = bias
 
-    def feedforward(self, x1, x2):
+    def feedforward(cls, x1, x2):
         #TODO
         return y
 
@@ -49,4 +49,4 @@ x1 = 2 , x2 = 3 , w1 = 0, w2= 1, b = 4
 
 Note: if you are confortable with matrix multiplication, feel free to vectorize the operations as done in the article. 
 
-https://victorzhou.com/blog/intro-to-neural-networks/
+https://victorzhou.com/blog/intro-to-neural-networks/