add missing characters in chars list

app.py

@@ -137,7 +137,7 @@ class BigramModel(nn.Module):
 # ----------------------------------------------------------------
 
 # helpers
-chars = list("!$&',-.3:;?ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz")
+chars = list("\n !$&',-.3:;?ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz")
 stoi = { ch:i for i,ch in enumerate(chars) }
 itos = { i:ch for i,ch in enumerate(chars) }
 encode = lambda s: [stoi[c] for c in s] # encoder: take a string, output a list of integers