requests not specified in requirements

[timo-herweg]

Requests is not a built in module and therefore needs to be installed first before you can run xborders. without requests you get the following error:

./xborders
Traceback (most recent call last):
  File "/home/th/xborder/./xborders", line 20, in <module>
    import requests
ModuleNotFoundError: No module named 'requests'

fixing this with the following:
pip3 install requests

this can also be made clear by adding a requirements.txt to the project to track current and upcoming requirements.

[timo-herweg]

with the merge of #38 this can now be closed, thanks!