image-hub README.md updated

[debjani1413]

Signed-off-by: debjani1413 deydebjani916@gmail.com

Description
The failing slack badge in README.md has been fixed.

This PR fixes #62

Notes to reviewers

Checklist

• Signed commits.
• PR title includes [<name of area>]:<description>

[aminoxix]

@debjani1413 : Almost done, just need to set pattern as :
[![Slack](https://img.shields.io/badge/Slack-@layer5.svg?logo=slack)](http://slack.layer5.io)

or just use this line, a short edit! 🙂

[debjani1413]

@Amino19 you mean instead of the edit I used I'll use the line mentioned by you right??

[aminoxix]

@debjani1413 : Yes.

[debjani1413]

@Amino19 I've done the required changes, do review !!

[aminoxix]

@debjani1413 : LGTM 🥳

@adithyaakrishna : Pl take this to your end.

[adithyaakrishna]

@Amino19 Are there any other PRs in other repo similar to this? If so please do mention me there, I'll check and approve. After that I'll ask @Nikhil-Ladha to Merge it :)

[aminoxix]

@adithyaakrishna : Yes sure, we have more issues in other repo similar to this, that needs newcomer to fix!

[welcome]

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