[Bug] Terminal Colors not reset after application exists

[mattdesmarais]

Bug reports

Please file a bug report here.

Expected Behavior

When go-prompt application is terminated (ctrl^D), terminal color's need to be reset.

Current Behavior and Steps to Reproduce

After exiting go-prompt application (ex: simple-echo), the terminal & shell (mac terminal, iterm2, ubuntu bash) are in a state where you cannot see any characters being typed. Restarting the shell resolved the issue, until the next time you run the go-prompt application:

`vagrant@dev:~/host_user_homedir/go-workspace/src/go-prompt/_example/simple-echo$ go run main.go

users
Your input: users
vagrant@dev:~/host_user_homedir/go-workspace/src/go-prompt/_example/simple-echo$ ddddddd: command not found
`

go-prompt-terminal.mov

Context

Mac 11.7 with iTerm2 and terminal
Ubuntu 20.04 with default bash shell

[mattdesmarais]

This looks like a dup of #228

[fasnow]

或者在程序执行os.Exit()前执行
cmd := exec.Command("reset")
err := cmd.Run()