fix: add back prompt global var

fixes an issue with multiline prompt overriding user's prompt
permanently

api.go

@@ -175,7 +175,7 @@ These will be formatted and replaced with the appropriate values.
 --- @param str string
 */
 func hlprompt(L *lua.LState) int {
-	prompt := L.CheckString(1)
+	prompt = L.CheckString(1)
 	lr.SetPrompt(fmtPrompt(prompt))
 
 	return 0

history.go

@@ -71,5 +71,5 @@ func (h *fileHistory) Len() int {
 }
 
 func (h *fileHistory) Dump() interface{} {
-	return nil
+	return h.items
 }

main.go

@@ -165,6 +165,7 @@ func main() {
 
 input:
 	for interactive {
+		lr.SetPrompt(fmtPrompt(prompt))
 		running = false
 
 		input, err := lr.Read()

vars.go

@@ -7,6 +7,7 @@ var (
 	defaultHistDir = ""
 	commonRequirePaths = "';./libs/?/init.lua;./?/init.lua;./?/?.lua'"
 
+	prompt string
 	multilinePrompt = "> "
 )