fix bug save value for ini config file

[zhangyongding]

No description provided.

[CLAassistant]

All committers have signed the CLA.

[zhangyongding]

#921

[sagikazarmark]

Can you please write a test demonstrating the faulty behavior?

[zhangyongding]

package main

import (
	"fmt"

	"github.com/spf13/viper"
)

func main() {
	viper.SetConfigFile("config.ini")
	viper.AddConfigPath(".")
	viper.SetConfigType("ini")

	viper.Set("set.boolKey", true)
	viper.Set("set.intKey", 1)

	viper.WriteConfig()
	fmt.Println(viper.ConfigFileUsed())
}

[sagikazarmark]

I meant an automated test to the existing set of test suites.

[zhangyongding]

Let me try

[sagikazarmark]

@zhangyongding can you add some tests here or probably in a separate test similar to toml proving the bug and that this patch fixes it?

Let me know if you need any help with it!

Thanks!