Wifi speed excepetion handle and dependency version update

[ksaswin]

Description

Speedtest-cli site have changed something in the response their API gives out and hence speedtest-cli version 2.1.2 throws a ValueError. Resolved it by updating the version number in the requirements.txt file. Also, updated the README file to include the command to install required dependency. Added a try and except block in wifiSpeed.py to handle the error when device is not connected to the internet.

Type of change

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• NOTE: These boxes can be checked using [X]

• [x] Bug fix (non-breaking change which fixes an issue)

• [x] New feature (non-breaking change which adds functionality)

• [ ] Documentation Update

Checklist:

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• [x] I have named my files and folder, according to this project's guidelines.
• [x] My code follows the style guidelines of this project.
• [x] My Pull Request has a descriptive title. (not a vague title like Update index.md)
• [x] I have commented on my code, particularly in hard-to-understand areas.
• [x] I have created a helpful and easy to understand README.md, according to the given README_TEMPLATE.
• [x] I have included a requirements.txt file (if external libraries are required.)
• [x] My changes do not produce any warnings.
• [x] I have added a working sample/screenshot of the script.

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