add truecolor support

char.go

@@ -2,7 +2,6 @@ package figlet4go
 
 import (
 	"errors"
-	"github.com/fatih/color"
 )
 
 // Represents a single ascii character
@@ -10,7 +9,7 @@ type asciiChar struct {
 	// Slice with the lines of the Char
 	Lines []string
 	// Color of the char
-	Color color.Attribute
+	Color Color
 }
 
 // Creates a new ascii character
@@ -28,9 +27,13 @@ func newAsciiChar(font *font, char rune) (*asciiChar, error) {
 
 // Return a line of the char as string with color if set
 func (char *asciiChar) GetLine(index int) string {
-	if char.Color != 0 {
-		colorFunc := color.New(char.Color).SprintFunc()
-		return colorFunc(char.Lines[index])
+	prefix := ""
+	suffix := ""
+
+	if char.Color != nil {
+		prefix = char.Color.getPrefix()
+		suffix = char.Color.getSuffix()
 	}
-	return char.Lines[index]
+
+	return prefix + char.Lines[index] + suffix
 }