Update app.py

app.py

@@ -25,7 +25,7 @@ class TextWindowProcessor:
             self.nlp = spacy.load("en_core_web_sm")
         except OSError:
             logger.info("Downloading spacy model...")
-            os.system("python -m spacy download en_core_web_sm")
+            spacy.cli.download("en_core_web_sm")
             self.nlp = spacy.load("en_core_web_sm")
 
         if 'sentencizer' not in self.nlp.pipe_names: