Fix typo in tags.go

Author: emret

Diff for: tags.go

@@ -5,7 +5,7 @@ import "strings"
 // tagOptions contains a slice of tag options
 type tagOptions []string
 
-// Has returns true if the given optiton is available in tagOptions
+// Has returns true if the given option is available in tagOptions
 func (t tagOptions) Has(opt string) bool {
 	for _, tagOpt := range t {
 		if tagOpt == opt {