Keep errors lowercase

baseelement.go

@@ -22,7 +22,7 @@ type BaseElement struct {
 
 func color(c *string) (uint8, error) {
 	if c == nil || len(*c) == 0 {
-		return 0, errors.New("Invalid color")
+		return 0, errors.New("invalid color")
 	}
 	if (*c)[0] == '#' {
 		i, err := hexToANSIColor(*c)
@@ -61,7 +61,7 @@ func colorSeq(fg *string, bg *string) (string, error) {
 		return seq + bs + "m", nil
 	}
 
-	return "", errors.New("Invalid color")
+	return "", errors.New("invalid color")
 }
 
 func formatToken(format string, token string) (string, error) {

listitem.go

@@ -13,7 +13,6 @@ type ItemElement struct {
 func (e *ItemElement) Render(w io.Writer, ctx RenderContext) error {
 	var el *BaseElement
 	if e.Enumeration > 0 {
-
 		el = &BaseElement{
 			Token:  e.Text,
 			Style:  ctx.style[Enumeration],

style.go

@@ -295,6 +295,6 @@ func keyToType(key string) (StyleType, error) {
 		return TableRow, nil
 
 	default:
-		return 0, fmt.Errorf("Invalid style element type: %s", key)
+		return 0, fmt.Errorf("invalid style element type: %s", key)
 	}
 }