Fix a typo in the readme.md file

[TPXP]

Hello!

First of all, this project is awesome. Thank you for bringing it live!

I have just found a little typo in the Readme.md, which can be confusing. At the very beginning, you talk about binary types and refer to the type Uinit8Array which doesn't exists as opposed to Uint8Array (you wrote init instead of int).

Thank your for correcting it!