readme: fix max_length parameter in text generation pipeline

README.md

@@ -49,9 +49,9 @@ However, text generation is a bit more interesting, so here's an example that sh
 from transformers import pipeline
 
 pipe = pipeline('text-generation', model="dbmdz/german-gpt2",
-                 tokenizer="dbmdz/german-gpt2", config={'max_length':800})   
+                 tokenizer="dbmdz/german-gpt2")
 
-text = pipe2("Der Sinn des Lebens ist es")[0]["generated_text"]
+text = pipe2("Der Sinn des Lebens ist es", max_length=100)[0]["generated_text"]
 
 print(text)
 ```