Updates Discord invite link Updates #2196

[zafar-hussain]

Describe your change:

• [ ] Add an algorithm?
• [x] Fix a bug or typo in an existing algorithm?
• [x] Documentation change?

References

Updates #2196

Checklist:

• [x] I have read CONTRIBUTING.md.
• [x] This pull request is all my own work -- I have not plagiarized it.
• [x] I know that pull requests will not be merged if they fail the automated tests.
• [ ] This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• [ ] All new Java files are placed inside an existing directory.
• [ ] All filenames are in all uppercase characters with no spaces or dashes.
• [ ] All functions and variable names follow Java naming conventions.
• [ ] All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• [x] If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.

A discord link in Readme.md was updated to the new link to discord invites, namely "https://the-algorithms.com/discord/"

[zafar-hussain]

@reviewers

please, if you can add "hacktoberfest-accepted" label, if this PR is fulfilled

cheers