Add TRYMODULE_HISTORY_PATH info to readme

Author: Victor Bjelkholm

readme.md

@@ -20,12 +20,14 @@ Same as above but with many packages in one go!
 
 ## Configuration
 
-There are two environment variable you can use to customize trymodule.
+There are a couple of environment variables you can use to customize trymodule.
 
 `TRYMODULE_PATH` for setting the path of where modules are stored. By default this is `$HOME/.trymodule` or `$USERPROFILE/.trymodule`
 
 `TRYMODULE_NONINTERACTIVE` for making trymodule not fire up the repl in the end. This is useful if you want to just install some packages for future use. By default this is undefined. Setting it to any value would make trymodule non-interactive.
 
+`TRYMODULE_HISTORY_PATH` for changing where to save the repl history. Should be pointing to a user write-able file. Defaults to `$TRYMODULE_PATH/repl_history`
+
 You can set the environment variables for one session with `export TRYMODULE_PATH=/usr/bin/trymodule` or for just one time by doing `TRYMOUDLE_PATH=/usr/bin/trymodule trymodule colors`.
 
 ## Remove installed packages