docs: update dependencies on README

Author: ronnnnn

Diff for: README.md

@@ -16,7 +16,6 @@
 # Dependencies
 
 - `bash`, `curl`, `tar`, and [POSIX utilities](https://pubs.opengroup.org/onlinepubs/9699919799/idx/utilities.html).
-- `SOME_ENV_VAR`: set this environment variable in your shell config to load the correct version of tool x.
 
 # Install