make sure no trailing spaces

Closes #99

Signed-off-by: Derek Che <drc@yahoo-inc.com>

text_formatter.go

@@ -68,8 +68,12 @@ func (f *TextFormatter) Format(entry *Entry) ([]byte, error) {
 		}
 	}
 
-	b.WriteByte('\n')
-	return b.Bytes(), nil
+	// remove trailing space
+	byts := b.Bytes()
+	byts = bytes.TrimSpace(byts)
+	byts = append(byts, '\n')
+
+	return byts, nil
 }
 
 func printColored(b *bytes.Buffer, entry *Entry, keys []string) {

text_formatter_test.go

@@ -31,3 +31,14 @@ func TestQuoting(t *testing.T) {
 	checkQuoting(false, errors.New("invalid"))
 	checkQuoting(true, errors.New("invalid argument"))
 }
+
+func TestTextPrint(t *testing.T) {
+	tf := &TextFormatter{DisableColors: true}
+	byts, _ := tf.Format(&Entry{Message: "msg content"})
+
+	// make sure no trailing spaces
+	if string(byts) !=
+		"time=\"0001-01-01T00:00:00Z\" level=panic msg=\"msg content\"\n" {
+		t.Errorf("not expected: %q", string(byts))
+	}
+}