Update README.md

docs: cant install anymore

README.md

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 Cucko is a Google Chrome browser extension that lets you hide the number of likes, retweets and replies a tweet has.
 
 ## Installation
-[Download the extension](https://chrome.google.com/webstore/detail/cuckoo-for-twitter/agjappnhmfoffegbhnakelgilanmnibb) from the Chrome web store here.
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+You can no longer install this extension.
 
 ## Development
 To get set up for local development, follow these steps: