Update app.py

app.py

@@ -30,7 +30,7 @@ def login():
         users =list(col.find())
         for user in users:
             
-            if usrname == user["username"] and password == user["password"]:
+            if usrname == user["Username"] and password == user["password"]:
                 st.success("Logged in as {}".format(usrname))
                 st.session_state["user"] = "logged"
                 flag = True