Update README.md

README.md

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 - [x] Advanced searching and sorting repositories and users, filter by language
 - [x] View repository and user details, events, issues, commits, pull requests, contributors, etc...
 - [x] View issue and pull request messages ([MessageKit](https://github.com/MessageKit/MessageKit))
+- [x] Tool for counting lines of code from github repositories ([codetabs](https://github.com/jolav/codetabs))
 - [x] The missing star history graph of github repos ([stars-history](https://github.com/timqian/star-history))
 - [x] Quickly browse the history of a file from any git repository ([git-history](https://github.com/pomber/git-history))
 - [x] Tool for visualizing GitHub profiles ([profile-summary-for-github](https://github.com/tipsy/profile-summary-for-github))