Fix link to CONTRIBUTING Guide in README

[ishaanxgupta]

Changes

Changed the contribution link in the readme which fixed the broken link

/documentation

Fixes #3325

[knative-prow]

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[knative-prow]

Welcome @ishaanxgupta! It looks like this is your first PR to knative/func 🎉

[knative-prow]

Hi @ishaanxgupta. Thanks for your PR.

I'm waiting for a github.com member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[intojhanurag]

/ok-to-test

[ishaanxgupta]

@intojhanurag if there are any changes please let me know

[ishaanxgupta]

@matejvasek @dsimansk @jrangelramos awaiting your review on this one