docs: Fixing behavior of environment variables

Signed-off-by: Vincent Boutour <[email protected]>

Author: ViBiOh

README.md

@@ -20,7 +20,7 @@ curl "https://dotfiles.vibioh.fr/bootstrap.sh" | bash
 
 You can set following environment variables for customizing installation behavior:
 
-- `DOTFILES_NO_NODE="true"` doesn't perform install of `installations/node` file (replace `NODE` by any uppercase filename in `installations/` dir)
+- `DOTFILES_NODE="true"` will perform install of `installations/node` file (replace `NODE` by any uppercase filename in `installations/` dir)
 
 ```bash
 #!/usr/bin/env bash