Update a gopls modernizer recommendation (#79)

* Update a gopls modernizer recommendation

* Use hue's Text method for slightly faster colouring

Author: FollowTheProcess

test.go

@@ -491,18 +491,18 @@ func CaptureOutput(tb testing.TB, fn func() error) (stdout, stderr string) {
 // prettyDiff takes a string diff in unified diff format and colourises it for easier viewing.
 func prettyDiff(diff string) string {
 	lines := strings.Split(diff, "\n")
-	for i := 0; i < len(lines); i++ {
+	for i := range lines {
 		trimmed := strings.TrimSpace(lines[i])
 		if strings.HasPrefix(trimmed, "---") || strings.HasPrefix(trimmed, "- ") {
-			lines[i] = red.Sprint(lines[i])
+			lines[i] = red.Text(lines[i])
 		}
 
 		if strings.HasPrefix(trimmed, "@@") {
-			lines[i] = header.Sprint(lines[i])
+			lines[i] = header.Text(lines[i])
 		}
 
 		if strings.HasPrefix(trimmed, "+++") || strings.HasPrefix(trimmed, "+ ") {
-			lines[i] = green.Sprint(lines[i])
+			lines[i] = green.Text(lines[i])
 		}
 	}