fixing second slice type needed

viper.go

diff --git a/viper.go b/viper.go
index 9eba0cd..47d027f 100644
--- a/viper.go
+++ b/viper.go
@@ -467,7 +467,7 @@
 
 // Returns the value associated with the key as a map to a slice of strings
 func GetStringMapStringSlice(key string) map[string][]string { return v.GetStringMapStringSlice(key) }
-func (v *Viper) GetStringMapStringSlice(key string) map[string]string {
+func (v *Viper) GetStringMapStringSlice(key string) map[string][]string {
 	return cast.ToStringMapStringSlice(v.Get(key))
 }