mv docs/restoring_{bash,shell}_history.md and update the doc

Signed-off-by: Mohammad Alsaleh <CE.Mohammad.AlSaleh@gmail.com>

README.md

@@ -49,7 +49,7 @@ Optional:
 
 - [restoring vim and neovim sessions](docs/restoring_vim_and_neovim_sessions.md)
 - [restoring pane contents](docs/restoring_pane_contents.md)
-- [restoring bash history](docs/restoring_bash_history.md) (experimental)
+- [restoring shell history](docs/restoring_shell_history.md) (experimental)
 
 Requirements / dependencies: `tmux 1.9` or higher, `bash`.
 
@@ -105,7 +105,7 @@ You should now be able to use the plugin.
 
 **Experimental features (also optional)**
 
-- [restoring bash history](docs/restoring_bash_history.md)
+- [restoring shell history](docs/restoring_shell_history.md)
 
 ### Other goodies
 

docs/restoring_bash_history.md

@@ -1,12 +0,0 @@
-# Restoring bash history (experimental)
-
-Enable feature with this option in `.tmux.conf`:
-
-    set -g @resurrect-save-bash-history 'on'
-
-Bash `history` for individual panes will now be saved and restored. Due to
-technical limitations, this only works for panes which have no program running
-in foreground when saving. `tmux-resurrect` will send history write command to
-each such pane. To prevent these commands from being added to history
-themselves, add `HISTCONTROL=ignoreboth` to your `.bashrc`
-(this is set by default in Ubuntu).

docs/restoring_shell_history.md

@@ -0,0 +1,19 @@
+# Restoring shell history (experimental)
+
+**Supported shells**: `bash` and `zsh`.
+
+Enable feature with this option in `.tmux.conf`:
+
+    set -g @resurrect-save-shell-history 'on'
+
+**Note**: the older `@resurrect-save-bash-history` is now an alias to
+`@resurrect-save-shell-history`.
+
+Shell `history` for individual panes will now be saved and restored. Due to
+technical limitations, this only works for panes which have no program running
+in foreground when saving. `tmux-resurrect` will send history write command to
+each such pane.
+
+To prevent these commands from being added to `bash` history
+themselves, add `HISTCONTROL=ignoreboth` to your `.bashrc`
+(this is set by default in Ubuntu).