Suggestion to Add a Detail to INSTALL.md

[AndrewLukan]

My apologies if this isn't proper procedure for making changes to a Github project.

I went through the guide and encountered an issue at cloning and installing agbcc.

At step 2 of Installation, these four commands are instructed to be used:

git clone https://github.com/pret/agbcc
cd agbcc
./build.sh
./install.sh ../pokefirered

As the guide has the copy icon, I pressed that and pasted all four into my Ubuntu terminal. For me, this was causing an error. Thankfully, GriffonR in the Discord told me to execute each one individually, and it was successful. I was able to build pokefirered.gba successfully thanks to them.

TL;DR, may I suggest a small text addition to that second step to execute each command one-by-one?