✨ Add AddFormatter function to allow custom builds to register new formatters

formatters/plain.go

@@ -8,16 +8,16 @@ import (
 	"github.com/spf13/viper"
 )
 
-func newPlain(ff *viper.Viper) (Formatter, error) {
+const FormatPlain string = "plain"
+
+func newPlain(*viper.Viper) (Formatter, error) {
 	return &PlainText{}, nil
 }
 
-type PlainText struct {
-	// config might go here some day
-}
+type PlainText struct{}
 
-func (pt *PlainText) Name() string {
-	return "plain"
+func (*PlainText) Name() string {
+	return FormatPlain
 }
 
 func (pt *PlainText) Logs(logs []models.Log) (out []byte, err error) {