docs (pt1): clarify version in link

Author: hlatourette

src/part1/hello_world.md

@@ -7,7 +7,7 @@ Note that we will need to type a lot of commands, so open a terminal now.
 It's a good idea to create a new directory (`mkdir gb_hello_world`, for example, then `cd gb_hello_world` to enter the new directory).
 
 Grab the following files (right-click each link, "Save Link As..."), and place them all in this new directory:
-- [`hello-world.asm`](../assets/hello-world.asm)
+- [`hello-world.asm` v5.3.0](../assets/hello-world.asm)
 - [`hardware.inc`](https://raw.githubusercontent.com/gbdev/hardware.inc/v5.3.0/hardware.inc)
 
 Then, still from a terminal within that directory, run the following three commands.