add bash-it

dot_bash_it/plugins/available/rbenv.plugin.bash

@@ -0,0 +1,10 @@
+# shellcheck shell=bash
+cite about-plugin
+about-plugin 'load rbenv, if you are using it'
+
+export RBENV_ROOT="$HOME/.rbenv"
+pathmunge "$RBENV_ROOT/bin"
+
+if _command_exists rbenv; then
+	eval "$(rbenv init - bash)"
+fi