Update app.py

app.py

@@ -5,7 +5,7 @@ import fitz
 def merge(pdfs):
   
   os.makedirs("out", exist_ok = True)
-  os.chir("./out")
+  os.chdir("./out")
   
   result = fitz.open()
   
@@ -15,7 +15,7 @@ def merge(pdfs):
       
   result.save("merge.pdf")
   
-  file = os.getcwd + "merge.pdf"
+  file = "merge.pdf"
   
   return file