Update app.py

app.py

@@ -46,7 +46,7 @@ LOADER_MAPPING = {
     ".md": (UnstructuredMarkdownLoader, {}),
     ".odt": (UnstructuredODTLoader, {}),
     #".pdf": (PDFMinerLoader, {}),
-    ".pdf": (UnstructuredPDFLoader, {})
+    ".pdf": (UnstructuredPDFLoader, {}),
     ".ppt": (UnstructuredPowerPointLoader, {}),
     ".pptx": (UnstructuredPowerPointLoader, {}),
     ".txt": (TextLoader, {"encoding": "utf8"}),