Update app.py

app.py

@@ -104,7 +104,7 @@ def update(sequence=DEFAULT_SEQ):
     response = requests.post('https://api.esmatlas.com/foldSequence/v1/pdb/', headers=headers, data=sequence)
     name = sequence[:3] + sequence[-3:] 
     pdb_string = response.content.decode('utf-8')
-    with tempfile.TemporaryFile(mode = "r+b") as tmp:
+    with tempfile.TemporaryFile(mode = "r+w") as tmp:
         tmp.write(pdb_string)
 
     return molecule(tmp.name), tmp.name