docs(installation): add missing version requirement for ble.sh

We had mentioned the version requirement for ble.sh >= 0.4 in README
[1], but it was later removed without updating the atuinsh/docs
repository [2].  Currently, the information about the version
requirement for ble.sh is not found anywhere in the documentation.
This is a situation similar to Ref. [3].  This issue is found in a
discussion on forum.atuin.sh [4].  Here, we shall update the
documentation to include the change in Ref. [1].

References:

[1] atuinsh/atuin#1465
[2] atuinsh/atuin#2203
[3] atuinsh#64
[4] https://forum.atuin.sh/t/1047

Author: akinomyoga

src/content/docs/guide/installation.mdx

@@ -146,9 +146,9 @@ After installing, remember to restart your shell.
     <TabItem label="bash">
         <Tabs>
             <TabItem label="ble.sh">
-                Atuin works best in bash when using [ble.sh](https://github.com/akinomyoga/ble.sh).
+                Atuin works best in bash when using [ble.sh](https://github.com/akinomyoga/ble.sh) >= 0.4.
 
-                With ble.sh installed and loaded in `~/.bashrc`, just add atuin to your `~/.bashrc`
+                With ble.sh (>= 0.4) installed and loaded in `~/.bashrc`, just add atuin to your `~/.bashrc`
 
                 ```shell
                 echo 'eval "$(atuin init bash)"' >> ~/.bashrc