Update BUILD.md

Author: YYTU-Aqua

docs/en/BUILD.md

@@ -25,7 +25,7 @@ sudo ./keyring.sh --alter-add --arch32-add
 Install the packages required for build.
 
 ```bash
-sudo pacman -S --needed git make arch-install-scripts squashfs-tools libisoburn dosfstools lynx archiso
+sudo pacman -S --needed git make arch-install-scripts squashfs-tools libisoburn dosfstools lynx archiso python-pytest python-setuptools
 ```
 
 #### Install the dependencies
@@ -169,4 +169,4 @@ xz
 zstd
     -Xcompression-level <compression-level>
     <compression-level> should be 1 .. 22 (default 15)
-```
+```