Add MustEncodeToString for convenience.

utio/string.go

@@ -17,6 +17,15 @@ func EncodeToString(e Encoder) (string, error) {
 	return WriteToString(e.Encode)
 }
 
+// MustEncodeToString returns the encoded string value and panics if an error has occurred
+func MustEncodeToString(e Encoder) string {
+	s, err := WriteToString(e.Encode)
+	if err != nil {
+		panic(err)
+	}
+	return s
+}
+
 // WriteToString returns the string value of the data written to fn.
 func WriteToString(fn WriteFunc) (string, error) {
 	var b = &bytes.Buffer{}