feat(module/history): add full configurability

While previusly configurable, it was inconsistent with other
configuration options and it was missing configurability of in memory /
on disc history size.

Signed-off-by: Shea690901 <ginny690901@hotmail.de>

modules/history/README.md

@@ -38,6 +38,35 @@ Alternately, you can set `HISTFILE` manually to _`${ZDOTDIR:-$HOME}/.zhistory`_.
 
 - `history-stat` lists the ten most used commands
 
+## Settings
+
+### histfile
+
+Can be configured either by setting HISTFILE manually before loading this
+module or by using zstyle:
+
+```sh
+zstyle ':prezto:module:history' histfile "<file_name>"
+```
+
+defaults to "${ZDOTDIR:-$HOME}/.zsh_history".
+
+## histsize
+
+```sh
+zstyle ':prezto:module:history' histsize <number>
+```
+
+defaults to 10000.
+
+## savehist
+
+```sh
+zstyle ':prezto:module:history' savehist <number>
+```
+
+defaults to histsize
+
 ## Authors
 
 _The authors of this module should be contacted via the [issue tracker][2]._