check command `type` is not valid

[ftwbzhao]

原来的逻辑校验lolcat命令不严谨，当命令不存在时，仍然可以执行echo "$@" | lolcat

---

if [ "type lolcat" ]; then

[PeterDaveHello]

@ftwbzhao Would you leave files under dist alone? I think it will only be regenerated when we bump its version, thanks.

[PeterDaveHello]

And I wonder if most of unix environments give *not found when failed. I think take the exit status code of type lolcat will a better method.

[ftwbzhao]

When use exit status code

    `type lolcat`                                                                                                            
    if [ $? -ne 127 ]; then  
        #here $@ = `type lolcat`                                                                                                         
        echo "$@" | lolcat                                                                            
    else                                                                                                                   
        echo "$@"                                                                                                          
    fi   

[ftwbzhao]

@PeterDaveHello depending on you.

[PeterDaveHello]

@ftwbzhao Would you like to modify this PR to use $? to determinate it?

[PeterDaveHello]

Hi @ftwbzhao, sorry for the late reply and fix, this problem has been fixed in b7bf7e1 and released in v0.0.6, feel free to try! Thanks.