Add 'requests' to requirements.txt

[vahan3x]

What

Add 'requests' library to requirements.txt

Why

While running passwords.py script, the following exception was encountered:

Traceback (most recent call last):
  File "[...]/roomba/Roomba980-Python/roomba/./password.py", line 296, in <module>
    main()
  File "[...]/roomba/Roomba980-Python/roomba/./password.py", line 293, in main
    get_passwd.get_password()
  File "[...]/roomba/Roomba980-Python/roomba/./password.py", line 117, in get_password
    from getcloudpassword import irobotAuth
  File "[...]/roomba/Roomba980-Python/roomba/getcloudpassword.py", line 20, in <module>
    import requests
ModuleNotFoundError: No module named 'requests'

Adding the library to requirements fixed the issue.