Fix tab issue.

As the title said.

viper.go

diff --git a/viper.go b/viper.go
index 680b331..6e166ba 100644
--- a/viper.go
+++ b/viper.go
@@ -108,11 +108,11 @@
 //  Defaults : {
 //  	"secret": "",
 //  	"user": "default",
-// 	    "endpoint": "https://localhost"
+// 	"endpoint": "https://localhost"
 //  }
 //  Config : {
 //  	"user": "root"
-//	    "secret": "defaultsecret"
+//	"secret": "defaultsecret"
 //  }
 //  Env : {
 //  	"secret": "somesecretkey"