Update 'README.md'

README.md

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 ## Per Diem
-- [Chatgpt](http://lucasstinchcombe.github.io/?url=chat.openai.com)
+- [ChatGPT](http://lucasstinchcombe.github.io/?url=chat.openai.com)
 - [Pomodoro](http://lucasstinchcombe.github.io/?url=https%3A%2F%2Fpomofocus.io%2Fapp)
 - [Pluralistic](https://pluralistic.net/)
 - [Wikileaks](https://wikileaks.org/)