all: Format code with gofumpt

See https://github.com/mvdan/gofumpt

tpl/strings/truncate.go

@@ -17,7 +17,6 @@ import (
 	"errors"
 	"html"
 	"html/template"
-
 	"regexp"
 	"unicode"
 	"unicode/utf8"

tpl/strings/truncate_test.go

@@ -15,7 +15,6 @@ package strings
 
 import (
 	"html/template"
-
 	"reflect"
 	"strings"
 	"testing"
@@ -81,5 +80,4 @@ func TestTruncate(t *testing.T) {
 	if err == nil {
 		t.Errorf("Should have errored")
 	}
-
 }