fix up git install + pull

master doesnt even exist in the repo
i have no idea why i wrote master instead of main

Author: Niko

README.md

@@ -57,7 +57,7 @@ There are multiple ways of installing.
 > [!WARNING]
 > Extensions loaded this way onto Safari indeed temporary. Once you close the window, it will be gone. In addition, ScratchTools is still outdated on Firefox at the time of writing this.
 
-- Installing with Git: Open the code dropdown on the extension's repository, copy the HTTPS url and then execute `git clone  https://github.com/STForScratch/ScratchTools.git -b main` in Git, and you have installed ScratchTools! To pull changes instead of cloning the repository, enter the folder and execute `git remote add upstream https://github.com/STForScratch/ScratchTools.git -b main`. When a commit is made to the repository, you can just run `git pull upstream master` to pull the changes, note that sometimes you may need to refresh ScratchTools.
+- Installing with Git: Open the code dropdown on the extension's repository, copy the HTTPS url and then execute `git clone https://github.com/STForScratch/ScratchTools.git -b main` in Git, and you have installed ScratchTools! To pull changes instead of cloning the repository, enter the folder and execute `git remote add upstream https://github.com/STForScratch/ScratchTools.git`. When a commit is made to the repository, you can just run `git pull upstream main` to pull the changes, note that sometimes you may need to refresh ScratchTools.
 
 ### Building a Feature
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