Update File name in Readme.md

[avsingh999]

Some of the files are not updated in the Readme file. If you want to contribute to Hacktober Fest. So this is a simple task 😉
❤️ Thanks ❤️

[Madelene]

Feel free to assign me on this one 👍🏼

[Cheemashyper]

No Problem @avsingh999 ,
Sorry for the delay but i'll definitely do it tomorrow ✊🏼

[iamkumar-gaurav]

may i have your Permission for this?

[neeraj-bhadani]

Please assign me. Thanks