WIP SETUP update

SETUP.md

@@ -39,9 +39,13 @@ On Arch, you will need:
 - `ruby`
 - `ruby-bundler`
 - `ruby-irb`
-- `ruby-foreman`
+- `ruby-foreman` (AUR)
 - `redis`
 - `postgresql`
+- `yarn`
+- `gmp` # for nio4r
+- `libidn` # for extconf
+- `base-devel` # catch all, TODO install specific packages
 
 ### Windows
 
@@ -80,7 +84,7 @@ mkdir -p data/redis
 redis-server ./redis-dev.conf
 
 # [Optional] Stop Redis
-kill "$(cat ./data/redis/redis-dev.pid)"
+# kill "$(cat ./data/redis/redis-dev.pid)"
 ```
 
 ## Ruby